There's Pal's Fallout Update Mod 1.2.5. http://www.nma-fallout.com/forum/dload.php?action=file&file_id=739
It adds a lot of new people and quests, along with the possibility to finish existing quests a different way.
Unfortunately, it was made for the official Interplay 1.1 patch, so I don't know if it'll still be compatible with TeamX's fixes.
Also, it was left largely unfinished and is not as complete as the FO2 Restoration Project. A lot of the new people are there just to show what the original devs had in mind, but they don't have any scripts or dialogue.
Still, I did a fresh install of FO1 and played through this version and think it's worth trying at least once in your life.

The new characters that DO work are very interesting, and you FINALLY get to finish the
Spoiler Find the Children Spy in the Followers
quest.