Posted this idea in a dead thread so i thought i'd throw it in here as well.
Marines and Aliens should be able to capture Power Nodes. Marines through the method now and Aliens through DI. Once taken over it produces energy for whoever controls it. The more you own the more energy it gives.
Energy is used by the CC/Obs on marines and Hive for aliens.
This would create a REASON to own more territory without being terribly game altering.
Bother teams would get increase energy regen allowing:
More Beacons, Nano Shields, and Scans.
Nutrient Mist and Chamber "useables".
If infested or built the lights would come on. Infestation would be cleared by either removing the DI from the room, Welders, or flame throwers.