Item Discount Less Than Price

You cannot create an discount to reduce the price of an item if an item exists that is priced less then the discount.  

I need to create a $10 off any appetizer discount, but because there is an appetizer in the category that is $9.95 I can’t.  The discount cannot be more than the price of any item in an allowed category.    

I need to create a $1 off any item discount, but because they have water at $0, I can’t.  

The discount should be allowed to be created, if there is an item prices lower then it should just discount to item to $0.