Cancelling ults with movement

Can this please not be a thing anymore? I don't understand why Fiddlesticks, Miss Fortune, Vel'koz (and more?) have their ults cancelled from right clicking. Generally cancelling an ult is just as serious as initiating it in the first place - which is why most players learn to be wary of fat fingering their R key. Yet, right clicking is not a clear indication that you want to cancel your ult. For anyone with an APM at least in the double digits, you're right clicking constantly. If it could be changed so ults that currently cancel via movement would require the player to repress the R key (a la Lucian) it'd be greatly appreciated.

It's just not fun when you have the perfect ult lined up with Fiddlesticks only to accidentally click and have a 120 second cooldown to sit and stew about it.