In my work with transliterated Arabic, Persian and Ottoman Turkish, I frequently need to use the following in small caps:
D, H, S, T, Z with dot under
A, I, U with macron above
All of these are available in the font as full-sized capitals with diacritics and as lower-case with diacritics. None of them are available as precomposed small caps in the Small Capitals from Capitals area, though there are other precomposed small-caps-with-diacritics in that area.
Regular, italic, semibold, semibold italic, bold and bold italic are all needed.
Since the small caps of the letters already exist, I'm hoping that adding dots under them will not present much of a problem and can be addressed. The work-arounds I'm using in InDesign are tedious.