How to use JSGME with TvT:
It's simply installed one folder "higher" in the folder tree, works just as usual for me.
It has to be this way because TvT reads everything in the root folder, if you have your "MODS" folder as usual, TvT reads the game files + the modded files in the MODS folder (even when the mod aren't installed) and the duplicate entries make the game crash.