compound coupon/reward

[Don Lundell]

The following functionality would be pretty handy:

Specify a coupon so that the customer gets (for example) 10% off
on an order, and one free item (item specified by me).

It's sort of a combination of coupon and reward.

One way for Shopsite to implement it might be to say that a reward
can be tied to a coupon - so the coupon gets the customer the percentage,
and the reward gets them the free item.

- dc