Removing Discount on Sales Orders/Invoices

I think it would be a great feature to remove Discount on Sales Order and Invoices. 

That way customers that I don't give Discounts to won't get curious if I give Discounts or not. 

It would also be a good idea to toggle between if I want to keep the Discount field or not. 
Possibly have a button in the C/V Central allowing me to check if I want to include Discount on the Sales Orders/Invoices. 

Just an idea that would be an awesome feature.