This is great and should be very useful. There are a couple of advantages pins have over POIs at the moment which would be great if you could incorporate:
1) On a large map, if you zoom out, pins are still clearly visible (the size doesn't scale with the map). POIs will become smaller as you zoom out, so become harder to see:
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2) With line of sight and visibility on (like you'd want in a dungeon), a pin is still visible once a character leaves the area, but a POI isn't:
Attachment 57575
I imagine both of those are because a POI is associated with a token, so may be hard to do anything about, but figured I'd request them anyway. :)