I was recently trying to develop my own spreadsheet on mana usage with a shot rotation with my current spec. While talking with a fellow guildie hunter he mentioned your site and I came here. After seeing this thread I downloaded Cheeky's spreadsheet to check it out. I like it a lot.
I do have a question and a bug report.
First the bug report. When I apply abacus of violent odds in my shot rotation it breaks the damage totals from that point on in the rotation.
If i set up a normal priority rotation with just Multi and Steady it lists my total dps as 1609.93dps. If i set up the same rotation but use Multi and Arcane it lists my total dps as 1558.94. Obviously the difference in mitigation types (arcane resist/armor) would change these numbers. Will you be adding the ability to factor in the differences in damage mitigation any time soon?