The brand new feature called "rebootcycle" extends WuInstall to fully automate reboots during windows updates. Now WuInstall is able to install all available windows updates until a reboot is necessary and continue with installing afterwards.
For example it is quite useful for new installed operating systems, for getting them up to date as fast as possible. Of course in the everyday usage for unattended updates this feature can also be a big benefit, when e.g. cumulative installing is needed. You can find further information how it works and how to use the rebootcycle in the documentation and also at the HowTos.