pid file segregation by uid?

[Greg Troxel <gdt%lexort.com@localhost>]

ups-nut has two configure paths for pidfile location, one for root and
one for non-root.

Typically a package has one daemon and puts the pidfile in /var/run/foo
if non-root, and /var/run if root.

Upstream paranoia doctrine is that a non-root daemon being able to write
1 into a root pidfile is dangerous because it can cause the shutdown to
invoke killing that with root, vs the unprived user.  So therefore I
should set the root pid path to /var/run and the non-root to
/var/run/nut and create that in rc.d/nutfoo.

The other approach is to just set all the /var/run/nut.


Precendent?
Opinions?