hildon-app-manager works.

Do uninstall the old version, but keep the confs around if you've done customization.

New deb puts confs in /etc/kismet. Defaults as noted above (but will change).

Kismet as root from xerm might still work. But it seemed to get hung after launching. kismet_server is setuid so runs from a normal xterm. So I run it in one xterm, then (after it says it is up) I launch kismet_client in a second xterm.