Having done some interface improvements to the main project and learned the data binding system that WPF provides (it's awesome, btw) I decided to update Multigon as well:
You now get an interface more in line with CorelDRAW standards, several ways to input the values + presets. Neat.
Also a new function - you can now shift the outer nodes by a percentage of a full step letting you make some rather neat shapes easily:
Two more improvements - the icons now look sharp and the rotational center of the shape is now set at the exact center of the shape.
Enjoy, feedback welcome.