I have some ideas for new weapons:
Flamethrower for pyros:2
1. A flamethrower that shoots a fireball raather than airblast for 25 ammo
2. stats for 2nd flamethrower:
while active:
+70% airblast push force
Speed increases ith damage dealt, up to 50%
No random critical hits
+70% push force taken from enemy airblasts
Vunerable to afterburn while active, and for 2 seconds after switching weapons

New Rocket launcher: firework launcher
50% damage bonus
Sets enemies on fire
100% mini cirts vs. burning targets
+40% faster projectile speed
No random critical hits
-75% smaller clip size

New PDA Idea
Replaces sentry with mini sentry
Replaces Dispenser with repair node that heals nearby friendly buildings
Replaces entrance with bomb that detonates automatically when players go near it
Replaces exit with a sheild that bloacks enemy projectiles

New Stickybomb launcher idea:
Loads up to three shots, then fires them in one huge burst
Stickybombs detonate automatically shortly after being shot out
Stickybombs are shot at full charge
-25% smaller clip size
-25% damage penalty