I believe one of the primary bugs in STT was the building plugin from Zombie Fortress crossing over and only allowing level 1 buildings to be constructed. Most of the bugs were of a similar nature, and could likely just be fixed via removing any conflicting modes/plugins. Personally I quite enjoyed STT, and I believe it was one of the more picked modes behind things like VSH and DR, and ahead of Smash Bros and Zombie Fortress as mentioned previously. Unfortunately I believe if S1 were to be converted to custom modes, the lineup would have to be rather small, potentially indefinitely, as adding too many varying modes would likely lead to things conflicting again, and there aren't a huge deal of options to begin with. Although leading on from that, there was never a huge deal of variety in the mode rotation anyway, as people primarily stuck to the same small handful, so perhaps it wouldn't be too bad of an idea