Mikael Nystrom has another good post on "back to basics". This time on CustomSettings.ini which is a file that commonly gets people confused because of it’s many uses and ways to do things.
One of the most important files in MDT (and in SCCM with MDT) is customsettings.ini, it is the rule file to rule your deployment. Yesterday Johan and I did a session at MMS and besides getting great scores and that is always fun. During that session I did a couple of demos around customsettings.ini and I would like to explain this a bit more. Because if you do understand the rules you can become much more dynamic and that will hopefully lead to less hassle and more work done in less time.