I was thinking about this and thought this might be a cool implimentation
your teamates have to charge you up to fire the teleporter
you fire it and down comes a booth like thing, and you could have a light coming out the top like in ons, this could then be used as a teleporter, but has a limited number of teleports in a certain time, and charges on its own
To keep things fair i think thats how it would have to work, you can step into any both, and teleport to another (Aslong as its your teams booth)
the desination booth loses the charge though
And you shouldnt start with any charge for the gun, just the gun
and you shouldnt be able to take the flag in, otherwise you could have one at your flag and one at theirs and just port back and forth and get like 5 points before the charge is lost ....
also some way of limiting the number of booths, and getting rid of pointless booths might have to be added
If this didnt happen, you could port anywhere on the map (a bit unfair .....) so you might want to be limited to 6 or so booths
But if a teamate fired one for a specifit reason, it could just sit there being pointles for the rest of the game, when u might actually need one later for a proper reason
The "booth" could be a 4 pronged structure coming to a top where the light would emit from, and to use it, you go in and jump up, (otherwise you could fire a booth to obstruct a way through, for the other team, or your team wouldnt be able to pass through beacause a port menu would come up)
Just a thought, this might be cool to do

Any ideas on this ? ....