Originally Posted by
Aseyhe
Clearcasting procs off autoattacks (with no internal cooldown) with a proc rate normalized to weapon speed (before haste) at 3.5 PPM. This means in cat form (which attacks 60 times per minute before haste), the proc chance per white attack is 3.5/60 ~= 5.83%. In bear form, it's 3.5/24 ~= 14.6%.
On average, it procs 3.5*(1+haste)*(1-miss) times per minute. If you moved it to RPPM, it would be natural to just specify 3.5 hasted RPPM. Or maybe 3 hasted RPPM to account for the way the bad luck streak prevention inflates the proc rate.
Adding another proc is an option. It would just be nice to not have to add another thing to display on the UI (especially the alert area, which Blizzard already covers with clearcasts and predatory swiftness).