D34THW41K3R

That's what the OP is saying, but he's asking: "what mod?" He wants to add it to tekkit lite

if you mean without a mod, just vanilla, then no... although, i haven't played any snapshots, so maybe in 1.5 lol

Sounds like the secret rooms mod if that helps

Redpower has issues. All you need to do is delete the Redpower folder in the config folder before you start up minecraft, every single time. I used to have the same issue when i used my minecraft I made that doesn't use the tekkit launcher. Hopefully redpower will update some time soon...