Actually, there's plenty of "Qbpf" out there -- between the
groff.texinfo manual, the Groff & Friends HOWTO, and the
historic AT&T documentation, it's mostly covered. The problem
is, "someone" needs to collect & organize it all, and perhaps
fill in a few missing pieces. As a single manual, it would be
intimidating -- I estimate over 500 pages. My mental outline
consists of two documents: a user guide (covering the standard
macro packages) and a macro hacker's reference.
I've actually started a prototype of a
"-modern" macro package; so far it consists of about 50 lines
of macro code on top of -ms. Some of the design goals are to
support cross-references, put the table of contents up front
where it belongs, build screen-oriented PDFs, and easy trans-
lation to HTML or possibly Docbook. (Grohtml is a brilliant
piece of work, but I'm a near-purist.) I'll make it available
when I have more of it working.