Update: the /castrandom

The /castrandom doesn't work like I'd hoped, so I'm sticking with the macro I had been using. Longer macros trying to optimize the 6 second and 10 second cooldowns are getting snarled by variable haste, so I'm just going to stick with it for now. (1900 dps on 10-man Archavon and 2400 on 25-man seems to suggest that I'm doing fine as-is.)