When I was using SMF I built a similar app for my forum. I have discarded it when I moved to SMF so I'm glad that there's on available in the market place.
There's just one little thing I miss from my old app. I used the G_PHYSICAL_MAP for map type to have it displayed by default in "terrain" mode. You can see it here (without any markers though). My forum is about overlanding and we like topo maps :)
I can look at your code/skin and find out where to change it but it would really save me some work if someone could tell me where to do it.