Angus Bohanon wrote an answer about Pearl Izumi EM Trail N 1 Trail Running Shoe - Women's on September 22, 2014
I have the La Sportiva Bushido, also a thin trail running shoe with a "rock plate," and I've biked in it. Obviously the shoe is not as stiff as a dedicated mountain biking shoe, but it's not too bad. The issue for me isn't stiffness, it's grip. The deep tread and lugs on the sole just do not play nicely with the pedals, and I felt out of control on faster, bumpier stuff. Like I was going to come off the pedals. Granted, the tread on these shoes don't look nearly as deep as the Bushidos (pictured), but my advice is if you're using platform pedals, you're going to want something with a flatter sole.