Game debounce time on abilities is too high. I have keyboard with optical switches with debounce time 0.2ms and i cannot quickscope on Vindicta for example, the game doesn't register my second click to cancel the scope of Vindicta's ultimate. I tested debounce time using macros getting delay of my keyboard bigger, and it works correctly with delay 0.25ms-ish. So i believe it's game issue. And I don't want to use macros to increase delay of my keyboard, it's probably can be banable as well.