Target champions only (keybinds)

I found the 'target champions only' hotkey in the options menu, which should help one targetting champions in minion waves/near large monsters, but found it unable to bind it to a comfortable key. This because shift isn't allowed as a stand-alone keybind and I use space for lock camera already. Seeing how this hotkey can effectively only be combined with other abilities, I was surprised it didn't function like smartcasting, the other hotkey that can only be combined with other abilities.

I have two suggestions on how to solve this:

• The 'target champions only hotkey' would be changed to a way similar to smartcasting in the options menu, this would mean we'd have an option for hotkeys to 'target only champions', similar to how we currently have an option to hotkey and ability to smartcast. Reasonable simple interface-wise with the new lay-out.
• We are allowed to set our own 'combination keys'. With combination keys, I mean keys that cannot be hotkeys on their own but have to be combined with at least one non-combination key (like shift is currently functioning). This would give players significantly more freedom in setting up hotkeys.

I hope there are other players out there that would like a change like this.