That kind of kills the option of people tagging on posts who AREN'T members, though.
And... I actually tested this the other day, when the poll went up, and I was able to comment on my own tag with a non-Marina journal. >.>; So if it's a function, it must not be on, currently!
I would say to leave it unlocked for at least a few weeks; maybe 'til the next app cycle or something. If people want to keep playing after that, they should app! X3