This is already done in PW, so you can just beg Vornne for the code, he might just share
1. The thing that allows you to see your teammates' names above their heads. Not the bot ones, but the actual players. So that guards can spot other guards faster when in a mob and also know who it is. And assassins are already facing quite a challenge when they try to coup cause they have to stand adjacent to each other to see the green name tag.
I must see what I can do about that, I have no real idea how to do this. I might ask Vornne
2. The thingy that allows you to see your teammates' classes. This is also in PW, if you go to your team's scoreboard, everyone's classes are written right after their names. Also, in PW you have the option of picking up armor from the dead max 30 sec after they died. I think this should be implemented mostly for the assassins so that they can dress as the dead people. Doesn't make sense, I know, but why not?
Same as for the first suggestion
3. Houses you can enter. In PW, when you stand in front of a door, most mapmakers have allowed you to pass it. You just get a yellow message and hold F (default use button) for a second. Once in the house, there are quite a few windows that you can use to snipe, or maybe you just wanted to hide from that mob for a second, or even set up an ambush for the guard who thinks your in here alone.
There are some problems with that. First thing: That can only be used by one guy at a time. So you could just wait at the entrance (in the house) with a dagger and stab everyone who enters as the guards can no longer outnumber you. Second is that Warband does not really have many good interior scene props to use, especially not those that fit directly into the houses (In Warband, the interiors are not included in the Houses)