zypper update brought me a kernel update this afternoon, which gave me an intriguing prompt:

      Overall download size: 158.1 M. After the operation, additional 2.2 M will be used.
      Continue? [yes/no]: yes
      kernel patch license:
      This update can be used to install a new kernel.
       
      If you decide to use the kernel update, we recommend that you reboot
      your system upon completion of the YaST Online Update, as additional
      kernel modules may be needed which can only be loaded after the system
      is rebooted.
       
      In order to install this package, you must agree to terms of the above licencse. Continue? [yes/no]:

That I think is as close as one gets in an urxvt window to replicating the windows functionality of prompting for reboots after updates.

I'm not entirely sure how good an idea it is to make the suggestion to reboot in a license exhibit for GPL'ed software. It just doesn't work on so many levels...