[DarkHoodness]

I know it's an unofficial mod, but surely they wouldn't piss off that many people judging by the popularity of Tekkit?

Nothing seems to be set in stone just yet, I'd wait a little bit to see what happens before you require people to install extra mods and start using them and possibly make our world incompatible with future versions of Tekkit... Then if we definitely know that they're going to screw up with future versions of Tekkit in ways which make existing worlds incompatible, then we can start using custom mods. There's plenty of stuff to do in existing Tekkit for the time being, isn't there?

But then that's just my opinion.