hmm fine answer. I agree also. Anyway for most functionality I have to do support by myself in Locus. Nice example is your map. This is really nice map and it's also simple WMS service. But I have to integrate this whole WMS stuff into Locus (and I really want to do this because it's very important feature).
anyway If you have any idea and want to realize, we should talk about it. As I told before, I don't know hot so simple create some addon support so it'll be slow and tough fight

EDIT1:
I have some ideas for nice addons that should be handy and I have not much time to create this like
- some graph addon that take intent with 2D data and draw graph - this should be really usable by many apps not even locus
- some addons for "Add new location". I have plan to do averaging feature but there is more possibilites
- also social networks as berkley wrote, this should be done as addon
EDIT2:
simple solution that can be done easy and fast. Send intent from app with for example request for location, and this return some value that I handle