I hope you guys realise that the idea of a flying alien has been suggested so many times but never actually been implemented 
Look at Risujin's balance mod with Redsky's vandal. 
I thought that project never really finished
I seem to be behind the times 
im using it (Slightly modded up) for NomX, so you'll see it there when im done with it....
also this is another "what if" thread....
and new forums arent created for ideas, they are created for well thought out projects with a purpose and developers to actually finish them and implement the (usually) great idea into tremulous
and most tremulous ideas that come from people are " i want a weapon that does some cool eeffect (or quotes videeo game weapon etc...)
frankly, what sthe point in that? the weapons in trem are what make trem.
so NomX was created because we wanted to add onto the gameplay with healing units/weapons and then add a extra weapon on top of the tech, turning a regular trem game into a all out faced-paced battle. it isnt being made because " i l1ke AU,to shotgunnn, l ets p ut it in trem!!1!!1111one"
so try to create a whole concept that makes sense and isnt so four out that it cant be done and maybe you can get somewhere with it.
hope this helps you out,
-Tamaru