1. Post a bunch of positive reviews on RMP for yourself. Not all at once, that would be suspicious. . . . But log on every now and then, create a new hotmail address for each fake persona if you have to (although I'm not sure it's necessary) and post away!Sounds like that'd do the trick.
But you know who really needs to take this advice? The Future Dr. Mrs Dr PGS. She's got a lot of seriously unprofessional-sounding comments on her Rate My Professor page. I know, because I put them there. Heh.