Currently tab targeting is “smart” but feels more annoying when interruptible casters are involved. Why not just remove it from current tab targeting and create a keybind specifically for it.
I’m not sure how people currently keybind their Target Nearest/Previous Enemy, I like to use the Mouse Wheel up/down. As for the zooming in/out keybinding, since I rarely use it, I just bind it to Alt + Mouse Wheel up/down.
It would be nice to have an option where I can keybind Shift + Mouse Wheel to target active caster and just remove it from standard targeting or perhaps have it as its own keybind for those who prefer it as an option.
You could also include enemies that have a buff for removal, but prioritize casts.