I wish I could get CarnEvil to work on my machine.
I have a Pentium D Dual Core 3.4 Ghz machine and the game is still so choppy that I can't even play it. I have the CHD and everything. Extremely minimal other software running on the machine. I can't figure out why it won't work for me either. If anyone has any tips on that, let me know...
OP, in regards to setting the buttons you just have to keep hitting whatever button you have set for select to get the OR going. So you would highlight the item you want to remap, hit the select button, press the button you want to set there. Then if you want to set another key for that (the OR command) you would just hit the select button again and hit the next button. Rinse, repeat. The main thing is that you don't move the cursor off of that button when you do it. If you move to a different button and then back and try to set it, it will just overwrite whats there. Man that sounded sort of confusing... Hopefully that made sense.
When in doubt, you can always just manually update the default cfg file.