I think it's in his spare time, to be honest. Which is really awesome because I don't know other companies with devs who use their spare time to talk to the fans of their games and take suggestions/criticism.
I usually stop by when im running a build and if there are ideas that are new, constructive, and well written, they get forwarded to the designers sitting 15 feet from me. If its something I can take care of and I like, I get it approved and get it done :)
Its cool he takes the time to visit, I remember back in 2000 when I was on the TWINE N64 board there were a couple designers from Eurocom that would stop by and answer questions. They took suggestions for the new game Night Fire, I made a suggestion of having Bond go 3rd person for certain parts where the camera would come out. They actually did that in the game which was pretty cool although I don't know if it was directly because of my suggestion. I think I had the idea from seeing early Metroid Prime footage of the morph ball :P
It's amazing. Local MP is becoming less and less common from game developers, but you're saying that direct feedback from the consumers themselves led to local MP being put in the game.
And I would think, with my vast (read: nonexistent) knowledge of coding, local multiplayer would be a lot less intensive to program into a game, not to mention it having been done far earlier in the history of the industry than online play...
PSN - scrumtrelescent7 "get lost you nub" -Richitu