Note before main Suggestion: I know that this a controversial topic and that lots of tools and lots of servers do not support IPv6. But in lots of locations around the world ISP assigns IPv6 addresses as well side by side to the IPv4.
My suggestion is to integrate support for IPv6 for storage node operators. Lately I was very lucky that my ISP left me alone and didn’t change my IP address to IPv6. This made me think that there are people that have a ISP gateway IPv4 address and a public IPv6. Hence they are unable to easily portfoward this leaves them with the option of VPN solution but that just increases latency and decreases network speed.
Lastly if it was up to me I would put this to somewhere near the top of the dev list as the future is highly likely IPv6 and since storj seems to be the future of storage, storj should to advance in cross support.