Grimrock

The original suggestion by many was simply to have the rune tiles stay clicked; meaning the mage focused on fireballs could easily cast them again and again.

LoG2 doesn't have clickable rune tiles [afaik], but uses a mouse gesture over the runes; not too removed from how Arx Fatalis worked in its own way... But interesting thing about Arx Fatalis, is that it allows the player to hold [shift] while casting, and did queue up to three spells in reserve that could be cast by pressing the 1, 2, or 3 keys. That could probably work in LoG2, and if not present, could probably be modded in.

I'm actually kind of hoping there are more uses for mages that aren't casting spells.
My mage had the best reach weapon I could find, for when I didn't want to use all the energy of a spell but still wanted him to attack.
Or I gave him the bombs.
I'd frequently had a spell set outside of battle, to just cast it as soon as I saw something, but having it as the default for that mage would be kind of nice.

I definitely love the fact you need to click the proper runes to activate a spell, because I (apparently?) also love panicking, fumbling up my clicks, and fizzling right into a "Game Over" screen. Probably something wrong with me that way . I do hope that there are more utility spells like the "blue light special" spell. A heal spell would likely be asking too much, but dodge or blinding spells could be a lot of fun.