I'm currently using the Free version of the Incredibuild for Visual Studio 2013 (https://www.incredibuild.com/accelerate-visual-studio-cc-builds.html).
Is there a way we can override VS's "Build Solution" button (F6) to use the Incredibuild "Build Solution" button (Ctrl + Alt + 8) instead at all?
As commented by @Drop you can simply override the default keyboard shortcuts to use the Incredibuild.BuildSolution for F6 via:
Tools->Options->Environment->Keyboard