Disable auto-calculate for all glyphs in bulk.
I needed a font with exaggerated spaces between letters and to achieve it I was able to change the left and right ranges, but then had to go to each glyph and disable auto-calculate on all of them. I only did it on the ones I actually needed. Doing it on all would have taken forever.
Bulk actions are actually something we are working on right now! We don't have an exact release date for the next update, but it should be in the next couple of weeks. The specific feature for turning off auto-width (and specifying a set width) for all glyphs will be one of the global actions.