I'm just gonna throw out some knobs for teleport changes that don't involve reducing the range/can be applied on a per faction basis:
- Add ammo, requiring a rebuild of the component after it's been expended
- Only allow teleportation to/from Quantum gate* (so QG -> field, or field -> QG). Alternatively, give quantum gate teleports unlimited range, but add a range restriction for backpacks.
*You have the flexibility here to increase the time required for gate teleports, widening the window for scouting while allowing the return time to be balanced independently.
What percentage of games are fullshare, and what's the priority in balancing this particular mechanic around them? Squaring that circle is going to be tough, akin to adding or removing a unit from Cybran based on victory condition.