What im thinking is that the sentry would be part of a PDA item.
it would replace the regular sentry with the LED sentry.
since people are saying it would shoot lasers and overheat, what about replacing the regular dispencer with a cooling device that allows the sentry to shoot for longer before overheating but dispences health and ammo in smaller amounts.
unless someone comes up with an idea for a teleporter replacement the will be the same.