[Observium] Disabling ARP table gathering

Is there an easy way to disable ARP table gathering on a per device basis. On some of our larger 6509 routers, dumping the large arp table every 5 minutes puts a bit of a load on them. It would also take some load off our observium server, not having to process all that data.

If not, I'd like to suggest it as a future feature.

Thanks Jeff