Quote from KaeltenOn another hand, Not only do I choose to side with the authors on this issue of whether they can opt-out of packs, I also will do so despite of what their license states.
A question about granularity of the proposed ui pack system if I may;
The UI Pack developers are acting some what like an Open Source OS distributor (RedHat/Debian/Canonical/etc). They're bundling things in to an end product that is at least in the spirit of the original works.
I would instruct UI Pack devs to research the licensing of the AddOns with in their packs, just as the above entities must. Further, unlicensed addons would require them to seek the authors explicit approval for its use. Anything that is too strict to allow its redistribution would require the UI Pack dev to find an accommodating alternative, or author a replacement with a suitable license on their own.
In this case, say the OP has figured out that his pack is mostly GPL/BSD licensed, and actually got permission from the unlicensed addon's authors to redistribute. Would there then be a method to get those addons back in for that specific compilation?
i.e. If say Phanx opted out of UI compilations in general, could he specifically opt-in to specific ones that have gotten his permission?
Visa versa, if an author opted in to UI compilations in general, then found a compilation that blatantly offended their better sensibilities, could they specifically opt-out of that specific compilation?