I think we've gotten close to agreement (or is it resignation?)
on pkgsets.

Hubert: suppose we make pkgsets strict supersets of pkgs.  Maybe we
add a +RECURSE file as second entry, or even instead of a +CONTENTS.
(I'm not committed to particular details.)

What do you think of revamping the "normal" pkg_* tools so that they
grok the pkgset format, and invoke themselves recursively on each
element of the pkgsets' contents, as either a pkg or another pkgset?
Maybe ignoring files that're "tape-recorded sysinst options"?

If thats OK with you and the pkg people, it seems like a
win/win to me.