quickpkg */* should create binaries for all installed packages. (Other extended atoms should work too of course.)
This is in git: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=a580aee32bec544889e08a76b4d0f308447f8d89
This is fixed in 2.1.10.28 and 2.2.0_alpha68.