Add coupon / discount code for all RSFORM in a website

I think it would be very usefull to have the option to create "coupon / discount code" valid and available for all form on a single website.

I make an example: I've 15 different form on a single website. All of them have the option "coupon / discount code", and it will be nice to create a coupon valid for all form or a selection of forms, instead of creating the same coupon for each single form.

I really would love it ;)