Basically right now, if I recall correctly, only vanilla wood blocks are compatible with the bark feature of Railcraft. Maybe every block that is ore:logWood should be compatible. Or a config option?

I have no idea what you are talking about. Bark Blocks?

It sounds like he wants to be able to make creosote blocks out of non-vanilla logs using the ore dictionary.

Mhm... the cherry wood from ExtraTrees is in logWood but it doesn't seem to work.
Proof: http://puu.sh/cYI74/2fcc40b338.png

That is a factorization thing, not railcraft

But that recipe already uses "logWood".

Oh god, I just realized... facepalm
Feel free to throw this issue into oblivion and burn it into the hottest pit of hell.
Sorry for the inconvience!