Q: Can I use zoneedit as dynamic DNS service?
A: Yes, you can.
For this to work you'll need to enable the DynDNS client, but edit the dyndns script to use zoneedit instead of dyndns service. Here's how:
If you look at /bin/dyndns, you could replace the snarf call from dyndns to zoneedit instead. The url is:
http://$DYNNAME:$DYNPASS@dynamic.zoneedit.com/auth/dynamic.html?host=$DYN_ACCOUNT&dnsto=$CURRENTIP
When dyndns is modified, make a copy of it into /boot/bin. You could statically set the rest of your zone using Zoneedit's web control panel.
Many thanks to Technojunky for this howto.