After reading about everything I can find on the subject while researching for a story, I've come to the conclusion that wormholes (or "jump" drives or gates) are the only potential "class" of FTL mechanisms which are even remotely (not a problem for fiction) plausible while also not opening the door to time travel / causality problems that are just ignored for the sake of telling the story. I'm not entirely sure about the door being closed, so that's what I'm looking for some feedback on. As far as I can work out, the time travel problem only manifests with a wormhole if you can accelerate one end relative to the other after creating it. Is this an accurate assessment? More to the point, if (because... scifi handwaving reasons) the ends must be fixed in space relative to one another, does the time travel boogyman still rear his head? I'm coming up with other technobabbleish restrictions as well to eliminate as many of the social and economic repercussions that I don't want to write about as possible (while leaving those I do intact), but like many, I want the "fun" of FTL travel while avoiding that pandoras box of paradoxes and time travel without simply ignoring it.