[arch-dev-public] Libexec policy?

I've been wondering why we do not have /usr/libexec. The GNOME packages apparently use --libexecdir=/usr/lib/$pkgname. We've been running into problems with GNOME 3.2 because increasingly more components depend on the libexecdir being the same across all packages (we already had this problem in GDM, where we currently patch). The other option, used by a few other packages, seems to be using --libexecdir=/usr/lib, which seems the next best solution to me. That is, if /usr/libexec is not available. Comments?