I filed a PR because the removal of the UCONSOLE option broke my setup
by making xconsole fail. It is PR kern/21304 (ignore the "kern" part for now).
It contains a bit of discussion boiling down to the point that, IMHO, xdm
and friends (I'm actually using gdm) are broken. They seem to not use
ttyaction(5) and we don't install the Give/TakeConsole hacks.

Any suggestion how to proceed from here?
I don't think re-adding UCONSOLE would be a good idea.

Martin