I have a small suggestion to you, Greg.
I'm too lazy to craft copper blocks out of ingots but I have to do it since compressing it results to dense copper plates.
I think it will be better to craft a new block called "copper plate" out of 8 copper ingots in such a way:
C C C
C X C
C C C
Where C is a copper ingot and X is empty.
Compressing copper plates will result in dense copper plates.
Copper when put in a compressor will give out copper blocks as with tin and many other materials.
Railcraft already provides a rolling machine recipe to turn copper into dense copper plates, so I'm not sure why Greg still hasn't made copper function the way all other metals do. CURSE YOU GREG FOR NOT DEVOTING MORE OF YOUR TIME TO WORKING ON THE MOD.
EDIT: Actually, it turns out if you disable crafting of copper blocks and enable compression of copper blocks, the dense copper plate compression recipe automatically vanishes. So apparently, it can be done right with just the configs. Still, it would be nice if Greg made this automatically detected.