Needs to be something more than just a button to click every time, or that could be just as easily forgotten too. My main problem with doing this now is I forget to turn it off before rendering sometimes, so there needs to be a script that turns it on at all times, leaves it in the scene and on at all times, but turns it off once the render is begun. And back on after it finishes.

Not asking much, am I? ;-)

I know virtually nothing about Python scripting, so I have no idea if the above is anywhere near approaching the realms of what's possible.