Some things in Railcraft would. Namely the engines would allow you a form of energy (in MJ) earlier than acquiring steel. Though it's steel production was the original progression in the defunct 1.5 pack. The anchors would be able to be used far earlier than I currently allow chunkloaders.
The rails would be useful, but would end up pushing even rails post nether (requiring steel and creosote.)
Dynamic Tanks are far superior to RC tanks imho.
I've considered adding RC back in, but I REALLY want to finish what is here first before working new stuff in. I'm also looking at the possibility of working in Steelworks if I can get it in without breaking things (further...)
Well, I guess I'll trust your judgment on this one. Thanks anyway!