I've added some examples which people may find useful:
Code:
menu_item :main :IP Address :cmd_output :500:/sbin/ifconfig | /usr/bin/awk '/inet addr/{print substr($2,6)}'
menu_item :main :Telnet :cmd_spawn :quiet:/bin/mount -t devpts | /bin/grep -q /dev/pts || { /bin/mkdir -p /dev/pts && /bin/mount -t devpts devpts /dev/pts; }
chain :cmd_spawn :quiet:/usr/bin/pkill -f "^/usr/bin/tcpsvd -E 0.0.0.0 1023" || true && exec /usr/bin/tcpsvd -E 0.0.0.0 1023 /usr/sbin/telnetd -i -l /bin/login
chain :dbg_toast :Started Telnet server on port 1023.
menu_item :main :FTP :cmd_spawn :quiet:/usr/bin/pkill -f "^/usr/bin/tcpsvd -E 0.0.0.0 1021" || true && exec /usr/bin/tcpsvd -E 0.0.0.0 1021 /usr/sbin/ftpd -w -t 30 /mnt/onboard
chain :dbg_toast :Started FTP server for KOBOeReader partition on port 1021.
menu_item :main :Import Books :nickel_misc :rescan_books_full
These are more flexible than devmode, but doesn't conflict with it and still doesn't require any additional software.