In using FileLocator Pro with large collections of source code, a search may hit dozens or hundreds of source files. I want to browse through many files, quickly examining the hits in the Internal Viewer. I had wished that the mouse scrollwheel would scroll whatever the mouse was pointing at (file list, Location Bar, Internal Viewer), instead of requiring clicking to focus. This is standard behavior in some Windows software, (and all on Mac).
I have suggested that as a feature. But in the meantime, I discovered utilities that apply that behavior consistently for Windows. Examples (you can google): AlwaysMouseWheel; WizMouse.