Keybinding Suggestion

In the hotkeys settings you have the option to use 2 keys to do things like level up an ability or use self cast etc. However, these keys are limited to shift, ctrl, and alt ( For example: shift + e can be used to self cast a shield on yourself, and ctrl + q could be used to level up your q ability) Since shift, ctrl, and alt are the only keys that allow this type of functionality it can be quite annoying to press them if you play with your pinky on q, ring finger on w, middle finger on e, and pointer finger on r.

Because most mice nowadays come with 2 buttons on the side of the mouse, being mouse 5 and mouse 4, I would like to suggest that you allow us to be able to use these 2 keys to provide the same functionality that shift, ctrl and alt provide. So that I can press mouse 5 + e and self cast, and mouse 4 + q to level it up.