Look no further than NWN2 for the quick cast menu.
Sort all prepared spells by level in a separate pop up UI.
On top, add tabs for +1, +2, +3... which turn the slots into up-leveled ones. If you want to cast Burning Hands with a 3rd level slot, select tab +2 which shows Burning Hands as a 3rd level spell.
Simple!
The current UI that puts every single activated ability on the same quick bar is horrible. And the spell UI that shows all possible up leveled spells all the time... horrible.
Last edited by 1varangian; 10/10/20 10:17 AM.