Crap...I just did some reading. Apparently, Shimano 10-speed MTB rear derailleurs don't work with Shimano road groups. But 9-speed MTB rear should work?
So how about the RD M530? The techdoc has a 11-34 min-max cassette...do you think it'll work with a 36t rear?
http://techdocs.shimano.com/media/techdocs/content/cycle/SI/Deore/RD-M530/SI-5VM0B-EN_v1_m56577569830604662.pdf