True but… "Most" but not "all" actions, maybe?
At some point there may be an UI issue if all extra actions have to be found in the scripts folder. (and as well documented the API is, the UI customization still requires extra scripting skills)
in case it is helpful: it seems like the workaround you provided works with glyphs that contain outlines, but not with glyphs that only contain components (for example accents in my font)
f = CurrentFont()
f['aacute'].selected = True
f['a'].selected = True
the code above, run when all glyphs are shown, will select a but not aacute.