Well, the short answer is YES you can use WIHU to install the hotfixes silently. See the hotfixes thread for a list of fixes and the switches to use. I must however tell you that I used to use the same process, and you will eventually run out of space on your CD (except if you are using as DVD). My personal opinion is that it is better to integrate as much as possible and safe valuable space in the process. Work out a process that will take a minimum of your time to rebuild the UA CD. It should take you only a few minutes to rebuild your CD. By the way, visit RyanVM for an excellent .Net silent install with all updates included.