..pherhaps put it under the DM general request topic? Bound to get more attention there.
(Not sure if I get it wrong, but I thought this general feedback was more for feedback on the permanent server, not event requests so to say.)
That said, I do find it a great idea to promote RP this way. Heck, I do so myself with my undertaker character. It's good fun to leave marks and occasionally even find responses to it, at one point I noticed some ghouls had actually robbed my graves and put the corpses into a sarcophage in the catacombs, brilliant.
..and that said, you could also take matters into your own hands and ask for permission to RP a haunting presence / RP the graverobber or report the case to the militia with Miuo? It's just a matter of hoping someone will tag along and create an equally fun RP oppurtunity for you by leaving his mark there.
(From what I hear it has already given you some RP, do try the DM request topic!)