4395 historical schemes

Hi, if an URI scheme x is related to a protocol y using port z, and
if there's an almost identical scheme sx using y over SSL port sz,
is it a good idea to register scheme sx as "historical" in the IANA
consideration of a revised x spec. ?

I have some necessary pieces (x, y, z, sx, sz) plus an old I-D for
sx (= snews) plus a new RFC (4642) declaring sz (563) as bad idea.

RFC 4395 says in chapter 4 "In some circumstances, it is appropriate
to note a URI scheme that was once in use", and from that I _guess_
that it's in many cases not appropriate.

Frank