I know I can add a compulsory discount to products, question is can i change it to optional.

More to the point are there plans to add an optional discount field

I know you are all thinking this is barmy, but I would like to have as below

Urgent delivery @ basic full rrp £65.00

Non urgent ie any time within next 30 days 20% discount or £52.00

Reason for this is I make each item by hand to order, and its better for me to work in batches, especially in summer time when orders are more limited, and I would only have to go into workshop say once a fortnight, giving me more leisure time ( I am semi-retired)