Emmanuel Dreyfus <manu@netbsd.org> typed:
: Currently, /dev/tty* are created mode 600 root/wheel.

All /dev/tty* (which are associated with /dev/pty*) are created
mode 666 on every platform.  Where did you get your MAKEDEV from?
Is this mode 600 specific to some configuration which you haven't
mentioned?

: Is there any problem creating them mode 620 root/tty?

Yes, it presumes the client program is user root, setuid root,
group tty or setgid tty.  With mode 666 anyone can get themselves
a pty/tty pair.

Regards,
-- 
Geoff Wing : <gcw@pobox.com>
Rxvt Stuff : <gcw@rxvt.org>
Zsh Stuff  : <gcw@zsh.org>