Exactly, those (maybe except Del) cause lots of troubles. Also, if possible Pause, Printscreen, Alt+F4 and F1. All those are free in 3DS MAX and I see no reason why in SU they are blocked.
Also, maybe not for now - think of multiple key shortcuts (ala Revit, SSE for “Slope Selected Edges” or MS for “Make Stair”) - they are way easier to get memorized.