I would firstly like to say thank you to all the ubercart developers for such a great ecommerce solution.

My request is to add the choice to remove role/s as well to give a role/s to the user through one product in uc_roles becomes rather important in some situations with subscription based sites.

For one example why this is necessary for a mixed subscription service and single sales site is:

Mixed subscription music site has two types of users, authenticated users are allowed to pay for individual tracks and album using file download products, so basically the uses the add to cart feature.

The second user is the subscribed user, through the purchase of a monthly subscription they are granted the user role subscribed user which allows the user to download anything for that month. To make it less confusing for the user, it would be ideal for all the single track/album sales disabled for the role subscribed user. The problem is that because the subscribed user is still an authenticated user which makes it impossible to disable these features which results in showing both the option of download the music file directly and the option of adding to their cart.

One solution is to create two roles which can be enabled and disabled, One role that enables the user to buy single tracks and another role for subscription. Through the purchase of subscription it removes the single track sales role and at the same time gives them the subscription role. When subscription expires it removes subscription and gives back old single track role.

This feature has been discussed here http://www.ubercart.org/forum/support/3751/uc_roles_and_display_currect_...

I do not have a great understanding of workflow nor the uc_roles module, If I attempt to implement this feature I'm afraid it will only be a cheap hack.