Actually Pizza, as of 1.5.0, oQueue will auto-magically disable itself when you log out. Had to sacrifice quite a few chickens (and beers) to the lua gods to divine how to solved that one
Now, if you log out and choose a toon that doesn't have oQueue enabled, then log in... you won't see the oQueue messages.
Hopefully that'll resolve any remaining usage issues when quick changing toons.