grant and SQL92

In process of converting a bunch of scripts from sybase to postgresql
I see something that doesn't make much sense..

I can grant a series of privileges (comma separated) on a series of
objects (comma separated) to either a user, group or public NOT a
comma separated list of users or groups. Yet at the bottom of the
man page for grant

http://www.postgresql.org/idocs/index.php?sql-grant.html

it says it's allowed in SQL92. How is it this isn't allowed in
postgresql, is it a real pain to implement or was it just never
needed?

I'm trying to come up with a way to do this:

grant all on xydata09 to vwonly,mngmnt,remusr,supusr,dbmngr,schdlr,intusr

on about 500 tables on the fly. Not all of them are the same permissions
per table but each file that creates a table has this and a couple of
revoke lines in it.

Workarounds?

Vince.
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