In reply to Open Type Kern feature for English and Bengali punctuation marks:
Okay, this should be fine according to Adobe's standard font license, so long as you do not distribute the modified font in any way.
I've done some work with kerning between Devanagari and punctuation, but I cannot recall the details of how and where it works or does not work. If I can find some extra time, I'll look into this. I recall that in MS apps this depends on the version of Windows.