These are an unsorted collection of thoughts by others or myself and may or may not get done depending ...
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When comparing, I suggest writing the log file with the the list of glyphs found only in the comparison font. That way, people developing a font who want to have equal coverage can easily see what glyphs they are missing. Since you are already discovering the information, why not log it ...
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Also, if there are first-font-only symbols (maybe not in this case -- is there a way to get a textual list of the differing code points?), I'd suggest trying an open box (cf. the shaded box for second-font-only).
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KB suggests to use a special default title when comparing showing both font names
- implement the question "Mathfont? (default no)" and make it automatically set the range-end to a large value