The latter option is reserved to the commercial version though.
What makes it interesting is that it can be used on mounted disc images, Windows installation folders or live systems. NTlite is a program that you can use for that purpose. Some tools may still come up in searches for example and it may be beneficial to the security of a system if certain features that you are not making use of are not installed at all. What's the purpose of installing Bluetooth support for example if you know you never need it? One could say that it does not really matter if features are installed or not as they don't get in the way usually and don't use lots of disk space either.
