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Pepperspray against armed and not-stunned sus

Is realistic. All you feel when you are pepper-sprayed with Police pepper-spray is pain, burning, you will have difficulties to breathe and can't see shit.

But yes it may be unrealistic if you use it against a suspect with a somewhat strong mask, ofc. a regular balaclava, e.g., wouldn't help.

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C2 trick

Well in real-life C2 would probably have more of a semi-circle radius of effect at the back of the door. And to compensate that we have the C2 trick, otherwise it wouldn't be necessary.

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Blocking doors by body

I suggest to only cover the door from in front or a slight angle instead of blocking.

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Close open doors without exposing

If you stack on the knob side, it is possible to open it IRL with little to no exposure but usually the officer IRL would back right up if the squad does not plan to enter. We can't really make this more realistic and imo exposing ourselves a bit would be a bit stupid.
Another thing: IRL you would be able to toss a flashbang or any grenade around a corner with only exposing your arm and you can't do that in SWAT anyway (while AI teammates can).

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Using map knowledge

This has always been a problem, but seriously. If your leader tells you to enter a room that you know (from experience), you will be shot right away you wouldn't just enter would you?
So I'd say: You can't help it.

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Opti wand

It's both boring and impractical (takes too long). I wouldn't use optiwands personally ever if I weren't ordered to.

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Gas without masks

Well. We use it a lot and it helps us a lot but it definitely is unrealistic. I'm not sure it either.

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Eye cams

I agree with your points, as it compensates for other inabilities to communicate, e.g.

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Flashbangs in close range to the team

I'd say it's okay if you have somewhat of space left from you and the 'hot' flashbang or if the flashbang is parted from you by a wall.

Pepperspray vs unstunned armed subjects...bad idea.

C2 Trick: the construction of the door within the frame prevents a radius effect. Normally, it blows mostly inward. If the door were to be opened before detonation you would have more left to right debris than normal. This would send some fragments in the direction of the team's side of the door. Also, there is no telling how the hinges would hold up under the tortional stress, you would most likely end up with a door swinging wildly on one damaged hinge within the door frame area causing the team to be delayed through the opening.

Body-wedging: bad idea for the reasons you mentioned. Not realistic in the smallest way. I would further state that even the very common act of closing an opened door to an uncleared room is bad for the same real life reasons. If tangos are set up inside a room to defend it and they observe the door mysteriously closing...it would take about .5 seconds to determine which side of the door you are on (if they saw your arm reach for the door, you are on the knob side; if they only saw the door close, you are on the hinge side) and then they would quickly remodel the walls on that side of the door.

Gas no masks: Thats a tough one. The game has the gas dissipate in about 8 seconds. I never actually timed it, but I think that is very close. For gameplay, they rightly took it down from the several minutes it would take inside a structure for enough air to exchange to make it breatheable. Officers often wait outside the effected area without masks on, but anyone even close to the area would have masks on in case wind direction changed or current through the structure changed. At any rate, CS is not a room clearing tactical aid. It's for softening the target by weakening their resolve and impeding their ability to make a focused defense when you do move in and assault. Some rooms are just made to give advantage to the tangos even when using flashbangs, so in these situations, I think CS with no masks prior to a flash or sting and clear is forgiveable.

EyeCams: They are currently mounted on rails on a swivel mount just behind the foregrip of the M4. They are used for wifi transmission of any pin hole cameras set up in the room where suspects have barricaded themselves so that teams know the layout and position of threats within a room with intel that is accurate right up to entry. It's not inconceivable that helmet cams would work the same way. Mostly helmet cams are used for remote viewing by the command and control. The reason why I think this is acceptable is that in real life you can feel the presence of officers around you, you can hear their movements, their breathing, they will touch your shoulder, etc...in the game, this is lost. I think the camera view gives you back some of this situational awareness that you would normally have in real life.

Real SAS teams toss flashbangs into the air for mid-air detonation and they are already in the room when it goes off sometimes....they are conditioned to ignore the flashbang and trained to avoid the flash effect even on multi-burst flashbangs. Earplugs now allow soft tones to penetrate like in whisper comm but restrict loud tones...like flashbang detonation. Use in close proximity to the team would certainly be accepted. When you think about it, flashbangs almost always detonate closer to the officers than they do to the tangos. Flashes are deployed just inside doorways and the officers are closer to the doors wink

And that, my friends, is my unsolicited opinion tongue

Just think of the SWAT tactic of pressing your body against a door that has c2 set on it and running full speed into it until it explodes and you go hurtling into the room. I call this tactic Explosive Door Humping. [...] Total crap. Completely unrealistic garbage. As a side-note, if you are carrying a tazer while you do this, you would make a great RAU member. Contact pumaseal via xfire.)

Tasers would not be used against armed suspects due to potential muscle seizure of a trigger finger within the area of the trigger guard.