Andrew,
Thanks for the mod I downloaded, but haven't installed yet. I was looking at the screenshots you included and on the pic of the checkout It looks like some of the reward points were redeemed AND they also earned points for that purchase.

Say someone buys an item that is 10.00 and they have 10.00 in reward points. They could use those points to pay the total AND earn reward points for that purchase. That is great for the customer, but that could become a nightmare for the owner.

Does it allow you to earn points off purchases made with points? If so do you think a future version could make that an option to be set from admin. Some thing like 'Let users earn points with redeemed points" Yes or No

Just my two cents