We believe in blending service treatments on the same day and we frequently have days were a client is having a facial and laser hair on the same day. The facial is not a medical service and gratuity is permissible. However, laser hair reduction is a medical service and gratuity is not permissible by law. So we have to coach our clients through calculating gratuity based on just the one service and often have to modify the order to reflect all of the gratuity going to just the non-medical provider.

I would like gratuity to be assignable to aestheticians and/or specific treatment (for facials), but not for RN injector for medical treatments such as botox/filler

There is no option to make a service that doesn't use a provider therefore our sauna is able to receive tips. I always tell people that our software won't let me turn that off. It gets kind of embarrassing to apologize for that every time (4 years of doing this so far.)

the option to make gratuity an option for only certain services or at least only certain providers. In some states medical professionals cant accept gratuity but the other service providers can, massage therapist etc