not only would RoC be unable to handle TFT settings but TFT changes some things that are in RoC, ie NE ballistas becoming glaive throwers (unless that was a patch), changing impaling bolts to vorpal blades, and a few others i cant think of right now.
not to mention it uses models, skins, icons, AND added abilities that would all be treated as imported/custom
adding to the pain TFT inflicts upon RoC is that RoC world edit only allows you to make custom units and items... not custom abilites.