[Tagging] landuse:illegal and illegal:yes/no

[Nathan Edgars II]

I would like to propose a few additions:
landuse=residential illegal=yes: residence of an illegal immigrant
landuse=farm illegal=yes: marijuana farm in countries where such is illegal
amenity=bank illegal=yes: headquarters or branch of a bank that has 
engaged in illegal practices

I trust one can see the problem with a general illegal=yes tag.