My guess is that Transgaming has signed an NDA with one or more of the companies that write copy protection schemes for games (eg. Safedisk), and is not even able to discuss what is required to make such hooks in Wine, or how to change the build procedure to make it possible for the scheme to work.
Mike
Your argument is valid right now because there was not attempt to abstract the copy protection through some kind of interface. We've had this discussion before, and Alexandre was willing to accommodate such hooks, but the argument was put forward that this is not possible. I simply do not believe you can't abstract it, anything can be. One reason why you may not want to is that you may be afraid that if people see the interface, they will figure out how to write their own copy-protection code. But this is a business, rather then a technical or legal reason...