Ham an cheese -
You will have to permanently install each mod pack.
The multiple install,on mod pack studio,has not been adressed yet.Start one mod-then whilst in the game-hit alt tab--- then control alt delete-- then end task-modpack studio.Do this for each one that you want in game-This way thay will all be in there when you want to play.When you grow tired off mods and want the original,slps back , just start game-hit reinstall and all will be like new again.
Strn Brightblade
"Be respectful,of those who dance in creativities shadows.
For there is no greater strenghth, than the stretch of ones imagination."