I use ad-hoc mode at home, as my linux firewall has an intel 2915abg minipci card in it, and I'm too lazy to get hostap working. I have no problem using dhcpcd on the linux firewall for the N800 to connect, so I strongly believe you could install dhcpd on the n800 and it would effectively work as an access point provided "clients" (peers, actually) understood ad-hoc mode.