I loved the assignable hotkeys for BG2! It made soloing the game as a Sorceress like a creative magical symphony.
Having started up BG2EE, the assignable keys are the same as in BG1EE. (Feh.) The big news for me was that not all spells have assignable keys! Death Spell is the final entry on the Mage List, which is not the highest level.
If this is already fixed in an upcoming patch, yay and thanks!