Trying to configure drops from grown wheat ("CROPS") doesn't result in a configuration error, but the block is not recognised by the plugin and it always drops the default drops. I have tried using "CROPS@7", "CROPS", "WHEAT", but none of them work.

My configuration: http://pastebin.com/1Nk09mHU

Turns out that when percentages are involved, if the object doesn't drop the custom drop it will drop the default one unless it is enclosed in curly brackets and a backup "drop: NOTHING" is specified. It was my understanding that if drops were configured it would always override the default drop, but apparently that isn't the case. The following configuration now works: http://pastebin.com/g8hd3QRt