Thanks Pior, I hope the selection highlighting options will be useful!

re: selection display updating on mouse release, it does work like that in MoI in some cases like if you click on an already selected curve or click on a face of an already selected solid. That's because in those cases MoI does not know at the initial mouse down if you are going to keep the button pressed and do a drag or whether you are going to release it for a click action instead of a drag action.

When you mouse down on an unselected object though it knows that it is going to become selected regardless of whether it ends up as a click or a drag. So in that case the display is updated at the mouse down so you can get feedback on it as soon as possible.

- Michael