Is there a button we can add to the toolbars up top to rotate an object 90˚ with each press? I thought there was but I can't find it now. Failing that, is there a macro someone has to add this feature? What about rigging a short-cut key to the button or macro? That would be perfect. I don't know how to write macros, and to me, it's all Greek.
You would do far better to learn the pick tool controls and modifier keys. Click an object twice, grab the corner with Ctrl Held and drag it. It will constrain to the angles you specify in Options. So much quicker in the long run otherwise you will need umpteen buttons to on a toolbar to do it your way.