Hmm..  there are a couple of those parameters that I can envision wanting to change...  (```le``` and ```lg``` in particular, as they indicate something about the overall level of dopamine).  That said, there's no good way to do that right now other than the weird ```BasalGanglia.le = 0.25; bg = basalGanglia(...)``` approach.  So I'm happy with the given change, and if someone wants better access to those parameters we can do that in the future.