Pack merging was broken in 0.9 because I'm a careless fool. Problem solved.
0.81beta
Fixed bug that would cause an error complaining in certain mods that there is no `rules.txt` file.
0.9beta
New release has several improvements:
* Automatically enables installed mods in Cemu * Stops merging packs when installing mods that have no packs * Added a script to export your entire mod configuration as a standalone mod in graphicPack, SDCafiine, or mlc title format
0.8beta
Give this thing a shot and tell me if I need to fix or add anything.
Possible bug: Will probably not work completely with non-US versions of BOTW.