I didnt see anything like it here in the wish list.
Besides is not exactly a wish but a suggestion.
I discover some time a go that GMs provide the service of putting some posters around Yliakum for a small fee, the issue is that is somewhat difficult to contact them because only Kerol does it. Well my idea is very simple, althou I dont know how hard would be to put in practice.
The point is to created an NPC who receives the fee, establish the period of time and receive as well the posters. As well as mark the locations the costumer preferred(e.g. type the location/click on it) This would be place automatically and then remove when the period of time is complete.
I am not sure if this is too hard to accomplished or not, but I think is a good way to do it.