Could I request a feature? The ability to "query" a tile; that is, report what the floor or wall is (material and constructed vs. natural), what buildings are on it (and if they're impassable), what items are on it (as of the last item update for that tile), level and type of liquid, creature occupancy, etc. This would ideally be activated by hovering the mouse over the desired square and pressing the "query" button. Since this information would already be stored by Stonesense it would just be a matter of retrieving and displaying it. This means that it should play nicely with the upcoming version - no work should be required to change the functionality beyond what would be done for Stonesense anyway.
I could potentially provide some pseudocode for the mouse position to tile function if you need it. It should be doable for you guys though, given the magic you've already wrought. The function might need to be used for the name display/mouse interaction anyway. A point to consider: should the function just return the first (highest z-level) non-empty tile underneath the cursor, or should it do a "raytrace" so you could choose a tile that is behind another tile with a ramp/creature in it? For example, if there is a bat in one tile and a dwarf in the tile isometrically below it, would we return the bat's tile all the time or would we return the dwarf's tile if the cursor wasn't pointed at the bat directly?