Things I'd like to see:
A slower charging, larger teleport which can teleport more than one person at a time (because watching 3+ people crowd around one teleporter trying to push each other off is just sad)
A dispenser which you could pick up and take with you (Couldn't use any weapons/build anything with it in your hands and it'd have a lower rate of health/weapon regen while carried. Possibly a reduced movespeed while carrying it as well. Basically it's for moving your shit forward/back, not for being a mobile dispenser machine.)
A level 3 Sentry with a higher tracking rate and slightly higher damage (+knockback) bullets but slower rate of fire and no rockets (because DAKKA DAKKA DAKKA)
A new Wrench which might have a greatly reduced melee damage but increases initial build time for buildings (so you can set up sentries/dispensers faster. Don't think it should affect upgrade speed).
Option to swap your pistol and shotgun for a Spy Check building which is a little node which bleeps whenever a spy entires a certain radius. Doesn't increase in frequency the closer the spy gets, just lets you know one is there. Edit: Also takes 3x damage from Sappers, meaning it'd die in 2-3 seconds no matter what level it was.
That last one is probably a bit overpowered, but the new wrench would be sweet~~~
