Appointment+: Options to modify Price of Services

It would be nice to add options to modify the prices of the services, which actually are fixed.

This would be usable for:
- differentiate price for different days (ex: 30$ from Mon to Fri and 50$ on Sat and Sun)
- differentiate price for different time of the day
- add options to the service and differentiate price according to the options (ex: number of players, extra services etc...)

Thanks for attention

Antonio