This patch should enable going back and redoing quests. Because I want to do Stealing The Independence again since my game glitched and made Sydney disappear. I know this may be a minor patch but it would help. I pretty sure I'm not the only person who wants to re-do a quest. I'm finished with the game (excluding DLCs) but I wantto go back ad do it gain.
As others have stated, start a new character and play through the whole game again. If there are particular quests you really enjoy doing, create a save right before you start it so you can go back and do it again and again. There is really no reason to make quests re-playable with the same character. Personally there are no individual quests that I would want to replay all by itself, and get a lot more out of making a completely new character.