Per day hourly charge

In the manage fields section, it would be helpful to be able to be able to do a per day hourly charge instead of only having the option to do per event or hour. For instance, currently when someone rents two spaces, it charges double for equipment/ custodial as there are two spaces being rented. It would be helpful to be able to make certain charges be charged on a per day basis so when they do use multiple spaces they can be charged one hourly rate for the usage.