Toolbar customization/selection.

Some days ago one collegue suggested that the matplotlibrc should
be hacked in order to accept a so-called "customtoolbar", in addition
to the 'classic' and 'toolbar2' options. I think that this feature
would not be complicated to implement, using the rcParams[ ... ] infrastructure.
Since I am rather new to Python and Matplotlib, I cannot evaluate all the
consequences.
Thanks,
Clovis