Throwing in my support here. This would be an extremely useful status to have. Currently, I use "Looking to Meld" as my status because no one really uses it, but this is silly.

I would like to add, however, that I think there should also be an OOC/RP in addition to an IC/RP status, because not everyone's going to use the IC/RP status even if it exists, which means there will still be folks without any status showing at events, and it'd be nice to have the option available to differentiate myself being OOC from those who are IC but not showing a status.