If your intention was to contribute fixes, I think you have commit
access to the ELPA repository.
My intention is to guarantee that this feature is known to the maximum
number of users possible, that it may actually be_useful_, rather than
languishing in ELPA. I'd been passively searching for such a feature
since the time not filling columns to a reasonable width became popular
with a certain programmer demographic, yet learned of adaptive-wrap from
word-of-mouth, not the package list, gnu-emacs-sources, or the like.
Had it been part of Emacs from the outset (thus documented, mentioned in
NEWS, and so on), it would undoubtedly be less obscure than it is now.