Just added weapons to a pet last night, here. You mean visually or effect wise? as the velium sword i added to my pet both showed up and used the process.
Of course, with the way my server goes.. I could sneeze and it not work.
edit: DOH: ignore this.. as I havent updated to newest version yet. My point is moot until I get the install done. Then will test it. Sorry about that. Forgot there was a new version out.