1. MSI feature tree doesn't let you "grey out" the feature. However, you can
use a feature condition to totally remove it from the tree. If you do this
though you need to ensure that the feature is always enabled on remove or
else it will be orphaned. See Bob's post: 
http://www.joyofsetup.com/2008/05/16/make-sure-features-are-always-enabled-so-they-can-be-removed/
http://www.joyofsetup.com/2008/05/16/make-sure-features-are-always-enabled-so-they-can-be-removed/
.

2. The correct way to register a dll is to author the registry values in the
MSI (there is a ton of information on why running self-registering dlls is a
bad idea). Look up the information on heat...it will extract the registry
information and add it to your component.
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