Please note that version 220.127.116.11 on RV082 and 18.104.22.168 on RV016 have some serious multicast performance issue. I did talk to Cisco support about this two days ago.
On both devices when I start about 15 multicast session (running from my linux servers trough ether RV unit to Cisco 2800 router that tunnels GRE multiast over VPN to remote location) with total aggregates 60K/sec data transfer the device (RV082 or RV016) slooooooooows down almost to none responsive. All computers connected trough this device are timing out. Performing net speed test several time shows speed about 700K/s down where if I stop all multicast traffic it goes back to 27M/s. If you upgrade your rv082 to 22.214.171.124 there is no way to go back to previous version now. That is why I did go and buy RV016 (needed new ports anyway). RV016 comes preloaded with 126.96.36.199 and 188.8.131.52 firmware. 184.108.40.206 it is little better than 220.127.116.11. But not much. Also RV016 is missing future that my rv082 had is build in DNS under DHCP tab.