Well you can definitely use teamspeak for this. Ranged classes can communicate properly through voice chat even in combat. Our only problem is that most SM players are going to play melee characters, lol. (Blood Angels for sure)
Well, i hope we won't get to many trolls or guys like "Badass1998", "Supersucker" etc. Like in planetside.
If they do the Black Rage perk ill do definitely the Assault marine. But i wonder if Space Wolves will have the same problem..
Well, i guess about 50% of the army should be tactical marines. You can't win the war using assault only. It's just one of the specs. Wolves probably will use a lot of tactical marines. I guess you should be able to give a sword to a tactical marine.