I don't know if this option would fall under a coupon or would be a discount:
Buy qty of X or more of included products and get free shipping (or set $ discounted from shipping - thinking for a client who offers standard shipping at a flat rate, and higher priority at additional flat rates. No gateway or automated calculations. They like to offer free standard shipping for this sort of deal seasonally, and if someone wants a higher shipping, they get the flat rate amount subtracted from that higher cost)
The current system seems to only allow to qualify orders by $ totals, but that won't work for the wide ranges the products cover.
Thank you.