I hope they went with something like what was suggested at one point - presets that are based on certain criteria.

Smite Level 1 - Use if enemy HP is 10 or more
Smite Level 2 Use if enemy HP is 20 or more
Etc.

You set the value.

Also, Use Smite if Crit as a preset option too.

OR

Just make Smite like Fighter Combat maneuvers. You decide before you attack if you're going to use it with a single preset button to turn on Use Smite for Crits.

Or something like that.

One of the worst offenders of popups in Solasta is the paladin because of Smite. It really does get tedious when you are asked every flipping attack whether you want to smite.