I'm pretty agnostic--not much difference between adding to local_settings and just editing settings.  I did it because... why not?  Nobody would ever override, except for a good reason--they'd just break their own system.  The functionality is simply there, no pain.

Some possible use-cases:
* For testing purposes, to keep testing models from syncing with production models
* When we duplicate this app to server content for other partners, we could test changes to the namespace by setting local_settings.
* If we ever wanted to set up a duplicate system, could just tweak the namespace in local_settings.

For me, settings are things that can never change--local_settings are the app-specific settings.  namespace is app-specific; KA Lite has one, others using the same codebase could have another.  So makes sense to me to have it in local_settings.. but really, no biggie to me.