During this morning's product meetup, there was some discussion of a forthcoming feature allowing users to edit the materials on items they've purchased in the Store. This will be limited to items placed in a scene and not include avatar attachments. Moreover, creators still can't take items they have modified in a scene back into their inventory for reuse. So it's limited.
Nevertheless, several people were concerned about the idea of their products being altered without their permission.
I honestly don't see a problem, but I wanted to bring the debate up here in hopes that those who have misgivings about this new feature would explain their concerns.