This was a homebrew that was approved some time ago, but it got lost in the mess or my poor organization, leading me to never actually posting it until now.
When outside of combat, a trained healer may attempt to manually aid a wound in healing, allowing them to maximize the healing spell at no cost. This may only be done outside of combat. It requires a skill check based off the heal skill at the following DCs based on spells. If the skill check fails the heal spell still goes off normally with rolled damage.
Mass spells require you to have one extra ‘nurse’ for each patient that can also pass an assisted version of the same check.