Rated by AniLeyo

Useful addon, but there are several issues related to merging/collapse:

(Tested on blender 5.0.1)

1. Merging/collapsing to UV borders break UVs though merging surfaces works fine. Maybe it's related to how blender operates merge at last/center
2. Option "merge on press only" doesnt work. Still need to click twice to make it merge/collapse