Hi Pior,

re:
> (in order to input the 4 points defining the axis or rotation and the desired amount of rotation at a glancing angle),

You can't get the last 2 out of the 4 points without leaving the viewport but you can type in your desired angle value instead of picking the 3rd and 4th points for it.

After you pick the first 2 points that set up the axis of rotation then type in 90 <enter>.

You can also set up a shortcut key where you can just pick the 2 axis points and automatically use 90 degrees without needing to type in that part.

To do that set this up on a shortcut key:

RotateAxis angleinput=90

- Michael