I don't know how complicated it would be to change or create the code needed for this but what I'd like to see in this mod pack is a way to enlarge the preview window. More and more people are getting 4K monitors and as such, the preview window becomes harder to observe on a big screen.
Another addition I think could be interesting would be to keep the temporarily removed mods displayed but grayed out. This would help to remember what packs were used previously but are currently disabled. I often find myself trying to remember the name of a specific mod that I really enjoyed using only to find it was removed an re-added later.
Other than that, keep up the great work and thank you for your dedication to keeping this mod pack updated quickly and frequently.