I think the potential for problems re: stalking is greater than the potential boon it could be in RP. If I want someone to comment to my character, I'm able to contact specific players through a wide variety of means or make an open request on Plurk or IRC with a link to the comment in question. However, as someone who has dealt with stalking and harassment online on LJ, I would not want someone to have the ability to track every comment I've made, even in public posts. (Especially in public, as I've had people find comments I've made in anonymous-enabled communities and have been harassed there.)

So, yeah. This idea makes me very uncomfortable and that's my reason for voting no.