I don't know about pattern planes but nearly all of the TRUE 3d planes I have seen or heard of have right thrust. You can hover fine without it, you just have to hold some right rudder in while you do it. That is just harder to do. I hear Chip Hyde uses no right thrust but programs right rudder to throttle mixing. Paul Swanson recommends 3 degrees right on Mojos of all sizes. UCD's come with 3 deg rt thrust built in, as do most ARFs. I have tried it all and now have 3 deg right thrust in all of my planes.