Prevent selecting/picking surfaces (while cross selecting)?

[Rhino_Bulgaria (Bobi)]

This also has the potential to help, if it ever gets implemented in Rhino:

Wish: Keys toolbar

I would like to be able to click icons that will act as if I have pressed an actual keyboard key. Here is an example menu where: a) clicking on the left side Alt (or another key on the left) will act as a single press and hold of the keyboard’s Alt key and will stay active until I press and then release the left mouse button. That could be very handy for those who use a 3d mouse and want to safely select objects or control points with a rectangular region while not leaving the 3d mouse with the…