to 2shortstories :

For coupon to apply on one product, I want to add that soon. I think I will make a catalog browse with ubrowser. That's why I asked some documentation to Ryan on the forum.

For the starting date, it could be added pretty easily, but it's not my priority at the moment.

to somatics :

Some people seems to have problems on PHP4 install. Do you run your website on PHP4 ? I'm looking for somebody to test and debug the module on PHP4.