I know these:
L+R+B=two foot modified gather) + (L+R+B=between the legs twice)
(X=one foot gather) + (L+R+Y=hang in rim) you can do this one from as far out as the free throw line!
(B=two foot gather) + (L+R+X=dee brown covered eyes dunk!)
the best i can do so far is: (L+R+forward motion on right stick=toss off the shot clock) + (X=one foot gather) + (L+R+Y= hang in rim)
ALL OF THESE ARE GUARANTEED 50's on any level of the dunk contest. I'll post more as i figure em out if you guys will do the same
XBOX ONLY PLEASE!!!!