Julian,
The answer to that question is... sorta. We sorta can at the moment. If you choose the setting "relative" mode in the fullscreen mode you will get a possibly decent version of what you're looking to do.
It helps us to work for a well tuned version of what you're looking for when we understand the application or how it's used. Any chance you can fill me in on how you use it with those settings? A video would be fantastic! A written description will be very useful.
Thanks Julian,
Justice