Casting spells during dialogue should be possible.
I mean spells like Friends, Charm Person, Detect Thoughts, etc. Too often I have those spells prepared, but end up in an important dialogue without realizing it's about to happen. I really don't want to keep hitting Quicksave every 20 seconds so that I can reload and cast those spells where I feel it's important. There's already a "Start battle" button in dialogue and I've never pressed it. I'd like there to be "Cast a spell" button as well, filtered to only show dialogue-relevant spells.