CMFreeLook and UI interactions

HI, I've just learned how to use CMFreeLook and it is working great in my desktop based project in that I can control my characters movements via the key inputs and rotate around the character with the mouse, all looks great.....until I want to interact with the UI, say to click on a menu button.

Obviously as I move the mouse to the UI button the camera rotates which is a little off putting when the intention is ... well just move and interact with the UI button.

The question is....is this the accepted behaviour that most developers accept and so does the end user or am I missing a key concept re this?

Thanks