I love this addon and I wish I could enable holiday items but exclude transmog which can only be worn during the event. I want to collect permanent, year round items. Items which can only be worn during the holiday are not interesting to me. I feel like this could be done with a little bit of code and an additional checkbox under the holiday items inclusion configuration area.

Additionally, transmog collected during the holidays is permanent, albeit usable with restrictions. This does not occur in such quantities in the addon warrant adding another filter that will affect the rest of the addon's performance.

You can disable holidays individually. Items and other collectibles that can only be obtained during those holidays are included in that already.