After you finish the main quest, can you still play in the capital wasteland?
I still have a decent amount of old content to replay through, but I want to finish the new stuff first.
Yes, once you have purchased and loaded Broken Steel you will be able to continue to explore the Wasteland. Just finish the game as you normally would and regardless of what choice you made you will end up at the Citadel with some new quests.
No I mean after I complete the last Broken Steel one. Will the game force you to stop like the original version or will it allow you to roam again?
allow you to roam again