I think it would be a good idea but digging a hole can actually take quite a while, and I would wan't it to be realistic in the time it takes. I could see players getting bored very quickly. I say add it but I don't think players will use it much.

I think this should be an option and not applied to all game types.

I think it would be cool if the major NATO countries would have their own loadouts , language/accents and stuff like in Arma 2. Not necessary but I would like it.

I would only agree to this if there was a way for the enemy team to identify an enemy in their uniform. For example if you are on the NATO team and you spot an Iranian soldier and you kill him and you take his uniform. The uniform should be bloody, if he was shot in the helmet there should be obvious damage to the helmet, if the player forgot to pick up the enemy gun that would be suspicious. This would set off small alarms for AI's and for players. Then lets say this NATO player in disguise walks into an Iranian Base. If an AI attempts to communicate with him, using some scripted conversation, this can help him identify enemy players because that unit won't know how to speak Arabic. Maybe they should add a linguist class or something to more easily get past security. Then lets say this Iranian base identifies the NATO player the base goes into lockdown making it very difficult for other players to infiltrate.

Its a bit complicated and no where near necessary to make this game but it could be interesting.