Here are the results of my test: map.cpp, query_map_point(): ... // tol is the original code tol calculation featureset_ptr fs = ds->features_at_point(mapnik::coord2d(x,y), tol/4); ...
postgis.cpp: featureset_ptr postgis_datasource::features_at_point(coord2d const& pt, double tol) const ... Envelope<double> box(pt.x - tol,pt.y - tol,pt.x + tol,pt.y + tol); ... ... with tol/4 you can easily click in point features, even some pixels away. With tol/8 it is still possible (and better than default behaviour). So any default will do as long as it can be adjusted afterwards on a per Layer basis.
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