Hey Dicko.
Well I had a read of Stop Freepbx from resetting configurations file
Seems harmless enough although I would then have to keep an eye out for other things.
Ahh the Cron does the job as ugly as it seems.
Guessing the people that edit the parking module would not be reading this and consider making the Silent option available and perhaps add in a destination if all slots busy.
Hv.