@OceanWolf I just created my first version of the multifiguremanager (MEP23)
https://github.com/fariza/matplotlib/tree/multifigure-manager

It has a couple of problems, but it works
Just if you have some time and want to do it, take a look at the example https://github.com/fariza/matplotlib/blob/multifigure-manager/examples/user_interfaces/multifiguremanager.py and give me some feedback on the functionality would be greatly appreciated.
The details of the implementation can be discussed later.

Thanks