Using MergeGlyph Version 0.2 (29) I am unable to batch merge multiple selections of glyphs and have to resort to manually merging one by one. Also, the keyboard shortcuts for Use Left and Use Right seem to be reversed i.e. Use Left is linked to the right arrow and vice versa.
The other issue I’ve noticed is that MG doesn’t seem to allow merging the extra layers of a glyph. It won’t always be the case that the layers should merge, however, in cases where they are used as bracket/ brace layers, virtual masters, and, particularly, as layers in a smart component it would be helpful to be able to turn on a feature to allow merging layers as well.