You could just, you know, stay near your squad and communicate with them. BF3 doesn't encourage teamwork at all, everyone just sort of does their own thing and sometimes that will mean the same thing for two people. That's not teamwork. Nobody communicates and everything is horribly disorganised.Maybe but is very easy to find your teammates, in RO 2 is a nightmare. But when you activate the tactical view sometimes you will have the terminator vision on like in BF 3. So I don't see this like such a big problem if you can turn it off.
RO and RO2 encourage teamwork by forcing players to actually communicate and work together, since they don't have a magic radar that tells them where all their teammates are at all times and they can't win without some organisation.
The game does not need any further HUD elements, especially not giant floating markers.
As for a great way to encourage teamwork? Get rid of the wonderweapons. Every time I see someone with a level 50 AVT, he's wasting an assault slot by playing sniper (and being bad at it). Forcing people to stop thinking they're a one-man army (which they essentially are with the max level MKb and AVT) would probably make them a lot less likely to be hiding at the back of the map doing absolutely nothing to help the team win.