Ever asked yourself what actually happens when you perform a certain thing in a certain program? Which files are read, created, updated and what goes on in my registry.
The Sysinternals Process Monitor tool does this. Filter the events any way you need and you will be able to release registry updates quickly. I just used it to identify the registry changes performed as I changed the cache settings of IE, so a registry update file can be made and distributed to anyone who needs the same settings. It took about 10 minutes to learn to use Process Monitor and identify the key in question.