when i say an end over end roll i mean a roll with very little side turn and not much axis rotation----say 20-25 degrees. when there is oil in the heads and the backends are dry this type of roll can result in great striking power from the outside line. walter ray williams, jr. is the master at this release---norm duke is a close second. chris barnes also excels at this type of release. most contemporary players do not have this shot in their bag.
speed control is very important. too little ball speed and the ball will roll out. the speed must be kept up for this reason. i don't have a problem with carry using this type of release. for me, carry is a matter of making a good shot.