Ouch !! I would guess we can simply ask for that "wishlist" item to
be elevated from a medium priority to maximum (unless someone is willing
to shed some light on what is needed to make it happen). A quick note,
from what I've seen other applications do, the number of composing
characters that most allow is 2. I believe that is the maximum number
that all languages use/require (so I'm unsure of the statement I read
on the link above that notes, "PuTTY should support an arbitrary sequence
of diacritics in any character cell").