Suggestion: Since Vault 15 is left completely unattended by the NCR after the squat joined the republic, why not add some NCR personnel since the squat gets a new map as well. There could be NCR guards and engineers messing around the vault, just that it doesn't remain completely deserted after you drive out the raiders (and the doctor on the first vault level doesn't take any notice of what's going on either). To add a little more life there could be a little quest as well. Perhaps help fight a small gang of khans who barricaded themselves on the second vault level and already struck down a few NCR blues or something like that. EDIT/UPDATE: To involve the doctor a bit more, how about this scenario: Some khans managed to hide or returned from a raid after the hero leaves and find the Vault deserted and darion dead. When NCR forces arrive they take the doc hostage and barricade themselves deep inside the vault. With no exit left a classic hostage situation occurs. The first attempt to resolve the situation by force failed and caused some casaulties on both sides. The Player is asked to help the local NCR rookies. Such a situation could offer numerous solutions: - Fight them, of course. There is the risk that the doc gets executed, however. - Persuade them to surrender - Persuade the NCR to give in to their demands and let them go - Drop something in a ventilation shaft on the second vault level to knock them out etc.