Is your feature request related to a problem? Please describe.
Excess time spent re-merging when changing/fixing mods.

Describe the solution you'd like
I would really love it if the merge -> compress feature didn't recompress mods that didn't need to be, perhaps by comparing mtime on the zip files with the mtime on the source mod folder? Alternatively some kind of combined hash of all files stored in a zip metadata file?

Describe alternatives you've considered
Don't think this applies, maybe I've missed something

Additional context
Nerp.