at first...I really really LOVE this mod =D
...now my suggestions ^^

1.maybe (in some later releases) more races; like necrons or chaos marines or sth like that (each map other races)
2.survival gamemode...player vs huge army of bot tyranids or sth like that (i rly like coop )
3.this is my personal opinion...i dont like the sound of the tyranid gun (the class you start with) it sounds like an air rifle...
and now...gotta go...gonna play your mod on a lan party