[GRASS-user] ps.map and vlabel - subheaders possible?

[wqual]

Hi list,
does anybody know whether it is possible to define subheaders for groups of 
vector categories of the same vector? "Normal" labels of such a group should 
only contain the range of the drawn categories - something like

LANDUSE (landuse at PERMANENT)
o forest
o urban area
o ...

This would be helpful for more complex legends...

Best,
Wolfgang