Allow slash in alternation patterns in limited cases?

[Mikael Magnusson <mikachu@gmail.com>]

You can't do (/foo/bar|/baz)/bong, but would it be possible to allow
it when each alternatee is a full pattern and there's nothing outside
the alternation? To put it another way:
/path/(to/file|or/another/file) # nope, too hard
(/path/to/a/dir/*|/path/to/some/other/files/*) # can we allow this?

The reason one might want this is for example doing things like
echo ($file1|file2)(om[1]) #where $file1 and $file2 are full paths to
files in different directories
echo (${(~j:|:)fpath}/_stat)(om)
etc

I imagine this is at least a little bit more possible than the general
case? The scanner() function is scary, but since I think some of you
have looked at it recently, is your gut feeling that it's doable? If
so, I'll have a try.

If not, would it be possible to invent some new syntax to "paste" two
or more globs together so that a single set of glob
quals/sorts/flags/subscripts could apply to it?

-- 
Mikael Magnusson