I've been mucking around with the Technic pack and I want to try to play game with only Mystcraft. I don't want to be bothered by managing/avoiding Taint from Thaumcraft nor do I want the multitude of chests I find in cave worlds to be cluttered by items from other mods.
I know that I can "disable" some mods by deleting them wholesale from the mods folder, but I'd like the ability to enable at a later time. I realize that there is a "Mod Select" button in the Technic Launcher but that button has been grey since my nana's 13th birthday so I don't expect any help in that direction.
Best Answer
The ability to disable mods has been removed from Technic Pack, which is why the button is greyed out. (I wanted to turn off a bunch of them when I was playing, and found that I couldn't after some research.) http://questions.technicpack.net/24/how-do-i-disable-certain-mods-from-a-pack has some info on it, but again, they say that the feature's been removed.
Considering Mystcraft is 1.4.6 compatible, your best bet is probably just to install that mod directly into a clean minecraft.jar file.
Mystcraft: http://www.minecraftforum.net/topic/918541-146-mystcraft-09500/ Forge (required by Mystcraft to load the mod): http://www.minecraftforge.net/forum/
Good luck!