Depends what you want. If this is to be (more) 'realistic' then you could be successful simulating the 99% boredom part of real militrary stuff.
No, that's okay, thanks. I think I'll just skip to the actual combat. The combat itself will be quite realistic however. And yes, that means the players will be working slowly and cautiously, even in death match.
Maybe you could have KP or Latrine-Duty mini-games to fill in the time (or a whole magnitude more non game stuff which you think can fill in their time
outside of the action.)
No, I really don't think so. Maybe I could animate the menus, though. Whenever you're on the character menu, have your other characters in the background, doing a lot of nothing that would be interesting normally, but works well enough as a background event.
Consider also that 'last man standing' games can go on and on (players often play more conservatively when out-on-death is a penalty.)
Well, yes. Already acknowledged that in the OP and planned for. The maps are small, however, and the player will never be without something to do unless they have already been killed. (And in some game types, they can come back.) Even then, they have some activities from the menu (databases, chat) in addition to spectating. Even in party matches, they don't have to stick around (although clans will probably expect you to) and can go to the other menus once permanantly out and do things there. (Customizing their characters or creating new ones, viewing old footage or reading the databases, viewing videos and extras, or just leaving it there while they go do something else until their team finishes its match.) Then they can jump right back into the lobby with their party with the push of a button, and be ready for the next match. The player will never be left without something to do just because they're out of the match.
I personally wish the games had more of that to swerve the developeres away from the absurd unrealist MP mechanism they now peddle to the crack-monkey ADHD player base they have cultivated.
You are preaching to the choir.