I use non-US keyboard where 1 2 3 etc. key-line corresponds to ą č ę and so on.
I cannot map those keys to skills (it just doesn't detect them) and have no way to activate them.
Other games can successfully map to diacritic letters and most of them are premapped correctly and behave ok even if you switch a keyboard map middle of the game.
Adding another keyboard layout to Windows is not an option.