Where can I get a list of all "variable=value" that pkg_admin can set?

[Ottavio Caruso <ottavio2006-usenet2012%yahoo.com@localhost>]

Hi,

$ man 1 pkg_admin

=====
The following commands are supported:
[...]

set variable=value pkg ...
Set variable with information about the installed package.  Use
unset to remove a variable.

Packages that are not installed directly by the user but pulled
in as dependencies are marked by setting "automatic=YES".
=====


$ grep "pkg_admin set" -R /usr/share/man/man*
/usr/share/man/man1/pkg_add.1:.Dl Ic pkg_admin set automatic=YES

Question: apart from "automatic=YES" for pkg_add and "rebuild=YES \*" 
for pkg_rolling-replace, is there any other practical use of the "set" 
command?

Is there a list of all possible variables that pkg_admin can set, or is 
that it?

--
Ottavio Caruso