I don't want to ship a desktop that doesn't let the user do useful things.
And you can ship a desktop SPIN that way. But the base pkgs should not install with an insecure set of choices.
if you want the spin to have a post-scriptlet which allows more things, then that's the choice of the desktop sig over the desktop spin.
Given how .pkla works, this is likely to be done with packages, not with %post hackery. (Which should make it much easier to reliably test, as well.)
Bill