new feature request

I have faked the kind of discount I want with flat discounts. However, I am limited to 6 correctly discounted items.

For 1 item we charge 5
For the 2nd item we charge 4, so total is 9 (5 + 4)
for 3+ items we charge 3 each,
3 items = 12 total (5 + 4 + 3)
4 items = 15 total (5 + 4 + 3 + 3)
5 items = 18 total (5 + 4 + 3 + 3 + 3)
etc.
So what I’d like is the discount only applied to the number of items at or above the minimum.

I believe this kind of pricing is common enough to make it worth the effort.