Uhhh..This is not an idea, but merely an inquiry.

Has there been a direct Time travelling RP . I mean like, you send a (or a group of chars back) in time and they complete some mission, so that another groups of chars can get through an area, thereby changing the timeline, to help complete the RP ? It's kinda like Singularity really, but I dun think I ever saw it here :O

I had a few thoughts about it and if it seems like someone wanted to take it, then feel free.