Modify the built-in platform movement It's possible to do it without, but it doesn't look very good, so use fastloops and/or Move Safely and lines of code in double figures if you want anything decent.
I think your best chance of getting a movement extension for TGF would be to bribe Fodo lots of money to make one for ya. That is assuming it can even be DONE in TGF. Everyone just assumes that anything you can do in MMF can be done in TGF but there have been changes made to the SDK that allow for more things to happen.... TGF just flat out doesn't have the ability to do some of the things MMF can do.....
Or, get Visual C++, grab a copy of the extension sdk (if you can even find it), and make one yourself.