Permanent organisers have access to edit (most of) the details of their own perms, including start place, additional start info (labelled 'County'), keywords (searchable) and a verbose description of unlimited length that could include a list of controls.
Until about a month ago there was a bug that had gone unreported for a long time, that was writing the County line from the organisers home address into the additional start info field. This incorrect info may in turn have contributed to some geocoding errors.
I notice there is currently a bug in both the Perms and Calendar events planner (again unreported) that interferes with the map widget that allows the org to set a Gpoint (lat-long) for the Start. Google Maps playing silly again - I can guess what the problem might be and hopfully it'll be fixed soon. EDIT: oh I see it's affecting all Gmaps on aukweb, not just the widget.
Geocoding the controls is certainly an interesting project and especially valuable for Permanents because of the convention that they can be started from any point. Currently aukweb doesn't have any data provision for this though it's certainly been thought about a few times.