I think it would be really handy if you could "nudge" rotate objects using the arrow keys, just like you move them.
ALT-LEFT / ALT-RIGHT could rotate in the X axis
ALT-UP / ALT-DOWN could rotate in the Y axis
ALT-CTRL-UP / ALT-CTRL-DOWN could rotate in the Z axis
They could all nudge in 15 degree increments, or hold down the shift key as well and you get 90 degrees.
Shapes like "wedge" I often find are pointing the wrong way, a quick shortcut would really save time.
Definitely quicker and easier than dragging, or clicking and typing.
Maybe Shift/Ctrl/Alt-M could also directly flip objects, rather than toggling the mirror controls?