amaroK should have mas and nmm in USE flags. Reproducible: Always Steps to Reproduce:
Don't know about mas, but I have (still, see Bug 44689) an eye on nmm and have to say unless someone steps up and puts a lot of effort in maintenance and adaption of outdated plugins (libmpeg2, divx4linux, ...) to get nmm into the tree, I don't see any support for it.
Even mas is not in the tree yet (and it's not clear if it will be), so I'm closing this for now.
bugzie
kde3 amarok is freezed and wont change anymore.