Anyone with experience in hacking the codesigning on OS X?
Before OS X 10.10, you can run sudo codesign -fs - /Applications/Utilities/Boot\ Camp\ Assistant.app to re-sign the app with an ad-hoc signature.

In order to re-sign it in 10.10, you need to additionally specify the --deep command to re-sign bootcamp:

sudo codesign -fs - /Applications/Utilities/Boot\ Camp\ Assistant.app --deep



  '--deep' When signing a bundle, specifies that nested code content such as helpers, frameworks, and plug-ins, should be recursively signed
               in turn. Beware that all signing options you specify will apply, in turn, to such nested content.
               When verifying a bundle, specifies that any nested code content will be recursively verified as to its full content. By default,
               verification of nested content is limited to a shallow investigation that may not detect changes to the nested code.
               When displaying a signature, specifies that a list of directly nested code should be written to the display output. This lists only
               code directly nested within the subject; anything nested indirectly will require recursive application of the codesign command.