Generally on LM you can get away with medding the players you know that play well. Find out what the regs can use, make them use it.
IE giving Ebnar an HMG is a good thing for the marine team.
Giving me a GL is also a good thing.
Look at the top of the scoreboard, but also take into consideration other things. Like who is defending your nodes, who's building the stuff in base that everyone walked by, etc. It irks me when I'm at the top of the board,
and I've been running all over being the comm's nodewhore, and I miss out on shotties or hamgees. Keep your reliable marines happy.
Oh, and HOLD YOUR NODES. That is absolutely key.