GPS is customised using Python. The provided scripts are in {installation}/share/gps/library
; it looks as though unused_entities.py
might be a good start. Or, there's a chapter on "Customizing and Extending GPS" in the GPS documentation.
[Edit]
Or, even better, look at the example globals.py
in {installation}/share/examples/gps/python
. A quick poke through the documentation (accessed in GPS via Help/Python extensions) suggests you're looking for GPS.Entities e
where e.category()
is "object"
.