It is a physical impossibility for whitelisting to work on Windows 7 unfortunately.
On Windows 10 you still have the issue that colour schemes and some fonts are global so would take effect no matter what.
We need to give it some thought on if this is viable or if it would confuse customers.
We do have a new product called Curtains which is in beta which depending on how much skinning you want might be more suited to your needs. It has no exclusion lists what so ever and is designed with maximum compatibility but with limitations that come with that.