While playing around with my AI's shooting ability I found that I was constantly doing calculations in my head to adjust the angle. Adding or subtracting a few degrees at a time.
Later I found a cheat sheet-
<img src="http://kifaru.net/images/Fig16_Det988.jpg" border="0" />
I downloaded it to my desktop and rotated to so it matched the C2's angle system.
Now I can just glance at the chart and instantly choose the angle I need.
Maybe a small cheat sheet Icon on all of the dialogs that have angles would be really helpful for people.
labeling the chart at increments of 22.5 would probably be enough for most people. I bet it could fit on a 32x32 icon.
I have all of the angles memorized at increments of 22.5 because I was a carpenter 20 years ago. The way 0 starts where most people put 90 really messes with my Dyslexia.
I end up spending a lot of time rotating the compass in my head, then choosing the angle I need. In school, and everytime I have use angles in the past 0 points north, up, or at the top of the document.
TLDR; It would make choosing angles a lots faster, if we has a simple compass key showing where 0 and some of the most commonly used angles are pointed, anywhere we are asked to enter an angle.