[Evilhomer]

I'll take a stab at answering your questions

1. You could set up a play by email game (in it players submit their pretender/turns to you/host through e-mail and you generate the new turn and post it back to players etc).

In the other option (non-pbem) you would have to a computer online constantly for the duration of the game.

2. Yes, this is no problem. You can also enable quick host (a new turn is generated when all players has submited his/her turn).

3. Yes, if the host is playing in the game he would log into the game seperatly like any other player basically.