I was amused to see a person who calls himself "Hesitation" asking about flinging his partner. (-:
In all seriousness, "fling" is a pretty dangerous word... I would try to find something more accurate to describe whatever action you're imagining (e.g. send, swing, sweep, shift, etc). If you really think "fling" is an accurate depiction of what you do, it's wrong.
Being on the "inside of turn" means a lot of things, and I can't say that taking a smaller step isn't one of them. But when all of the other elements are there and properly executed, the step size differential is so minimal that it should hardly be evident.
It has been my personal experience that students who put too much stock in step size differential are typically lacking in other areas. Techniques such as proper execution of CBM, timing of rotation to direction, proper drive and swing, well-timed hip angle changes, and even basic body contact all work together to minimize the need for a differential.
More importantly, these techniques will most certainly eliminate any feeling that you're "flinging" your partner.
Regards,
Jonathan Atkinson
www.ballroomdancers.com