Hi, lately I spoted that quite few packages have optional parts bit unstable (KDE parts, boinc [i wont stable it until the cuda is, i wont do the work explained bellow :)], kipi,...). I really don't like the shebang about doing -r1 and -r50 so we keep 2 revisions where one is stableable and second is not. So how about having this nice file (topic), it quite self-explainable by the name. Also syntax would be same as for package.use.mask and same goes for placement :]
Cheers Tomas