Just as you can hit alt+click to select all the units of the same type, I'd like to be able to hit alt+click on an ability and have all units with that ability activate them at once. This would include the same behavior for right click setting autocasts - at the moment, it's inconsistent.
I find it an eternal bugbear of the special abilities that you have to either leave them on autocast, or trigger them individually - getting a pack of Kodiaks to Intercept as a group, or even a pair of Kols to fire off their flak burst simultaneously can be a bit of a pain.