[mkgmap-dev] Is it possible with --add-poi-to-lines option and style rules to create pois only for ways with a min/max/equal length?

Hi, i try to create a map including hiking trail markings usin r2748. So far i succeded using --add-poi-to-lines option and making the needed setting within relation and points style files. For every way part of a hiking route a poi is created. But to prevent map to be overcrowded by those trail marking pois, i would like to create those kind of POIs only for way parts with a minimum length. Something like "highway=* & length() >100 {set mkgmap:line2poi=false}" in the lines file, doesn't seems to work. (As far as i read meanwhile, points are processed before lines, so this can't work.) Is there a way with actuall code version to achieve it? best regards Gert