Vanguard set-up (Useful in Pelargir, mostly for dps classes who can build pips fast):
Officer set-up (Useful for everyone, re-spec officer then switch to engineer to move barricades and set traps):
Traps set-up (Useful for everyone use throughout battle to set traps):
Catapult set-up (Useful in the 12 man, only for the two people manning the catapults tho):
All of these require that you have maximum points to spend, which I realize is not easy to do, and of course they are only suggestions :)