In my opinion private packs should really be a little different. I don't see why the ftb team cannot request permission for all the current mods to be used in private packs as well, they would only have to request permission once and more likely than not the mod authors will be fine with it. If not then the creators of the private pack will need to inquire separately. All this means is that there would be a list of mods that can be used without additional permission, and any further mods that people want, will need permission. This way people can pick and choose the mods they love from the packs they love without unnecessary hassle. 90% of the people making private packs only want to customize the mods already available in ftb mod packs. To me this just seems to make sense. Although there still could be an unforeseeable reason for why this cannot happen, i'm more than willing to listen to the reasoning but for the moment this seems like a really great idea to me.