Disable EE Transmutation?

[deejkdeejk]

I'm thinking about making a Tekkit drug server, but my obvious problem lies in that if players are able to condense massive amounts of drugs, the whole theme is lost. I was wondering if there's a way to config EE so that I could selectively disallow the transmutation of certain items (i.e. sugar cane) while not completely banning the item?

I want EE because I like the idea of unlimited building mats, but if this gets too convoluted, I guess I'll just drop it.