I think a slick laser mouse would be better than the MBP trackpad for those pixel-by-pixel tasks in PS or Elements. Don't think I care if it is bluetooth or not, same for multiple buttons, reprogrammable features, gaming and such. If the suggested mouse has those features, then fine. Its size or if it works on batteries or recharger is also not real important to me, unless convinced otherwise. A trackball sounds interesting, if they really are. I do know that I want no weird software problems! Thanks for any input.