I can see the appeal, but on the other hand its more clicks - casting hex is already annoying, especially since penalty to a particular ability roll in combat is near irrelevant as far as I know. personally, 2 buttons on quickbar, 1 for spell at default level, 1 for selecting a cast at a higher level would be nice.
I don’t think clicking would be necessary. However over a spell and additional option could expand above it. Want to cast basic version - just click on the icon. Want to empower the spell? Choose one of the icons above.
Same I think should apply to mentioned “scrollcases, potion bags, missile quavers†- just hover over them and have the content expand above.
