Well I figured it out. For those trying to do the same thing, here's what I did.
- cat /proc/self/mountinfo - This was just to get the list of mountpoints
- mount -o rw,remount -t yaffs2 /dev/root / - This mounts the drive for read/write
- chmod 777 build.prop - This allows me to overwrite or edit the build.prop
- edit the build.prop and save it
- chmod 750 build.prop - I'm not 100% certain this is the right permissions for build.prop but it should be safe.
- reboot
The device is certainly more usable now.