I love the idea of getting the network hardware racked in a small 8U or 10U unit; maybe even with casters on the bottom so it can be easily rolled in and out of the venue.
Regarding general caching of web traffic, you can
install squid
in pfSense and provision a cache size of your choosing to take caching a step further. It would probably be worthwhile to find a way to exclude Steam-destined traffic from Squid so we're not double-caching or negating the benefits of the Steam reverse proxy.
I think that the PRTG integration to ALP would be very helpful for responsible LAN participants that want to be aware of their usage and help minimize harmful network traffic/Internet usage. If I saw that I was still pulling 2Mbps I might realize that I left my BT client running (I'm not really a BT user, that said) and could shut it down. As this is a web integration, if you'd like me to look into the implementation I'd be happy to take a look at the ALP source and the PRTG API and see what we can do.
All in all, I think the network performance at v13 was a great improvement over some of the obstacles that were faced at the two prior LANs. There's a clear path of improvement already set for v14 and I'm excited to see what other innovations like the Steam proxy are implemented in LANs to come.