So you can open a bugzilla request for enabling it e.g. on the
Hungarian Wikipedia. Brion et al. can correct me if I'm wrong, but at
this point I think there are no major reasons not to just enable it by
default at least for Wikipedias, except for its limited language
support e.g. for CJK and RTL languages.
Due to the scale of en.wp, we have scheduled full deployment there
(currently it's for logged in users only) tentatively for 4/20 and
might delay a bit further if necessary to accommodate the anticipated
scale of use.