Estella

To run screen as non-root:

chmod 0111 /usr/local/bin/screen
chown nobody:utmp /usr/local/bin/screen

# Run this. Add into /etc/rc.local as well if you have clear_tmp_enable="YES"
install -d -o root -g wheel -m 1777 /tmp/uscreens

Add this to /usr/local/etc/pkgtools.conf in the AFTERINSTALL block as so for auto fixing screen on portupgrade:
AFTERINSTALL = {