Maybe it would be a good solution, to look at first, if one node of the polygon is tagged as building=entrance. If there is one, use this node as POI-node, else create an node in the centre of the polygon.
That would be easy to realize. For mulitpolygons one could also check if there is a point with role "label" and use this point for the POI.
@WanMil: Do you see a more or less easy way to control the creation of POI out of areas with a style-file? So that it is possible to have POI out of polygons, which should not be rendered as a polygon. Now this is only possible with a transparent polygon.
Did you try the patch? I think you no longer need any rule in the polygons file. For each polygon (no matter if there is a rule or not) a POI is created and processed by the points style file. So the solution is: * Add a rule to your points style file * Remove the rule from your polygons style file (Please let me know if it works :-) WanMil
Henning