In a consortium scenario it is possible that one or several nodes (it can be a regular or validator) would want to be independent at some point in the chain.
Currently Pantheon does not have implemented a way to create a fork on an IBFT2.0 network.
In the context, validators have total control of the network; so an ability to fork without involving the current validators is needed.
Implement code on Pantheon network to make a fork in the previous explained environment.
One approach could be to define a new milestone at which a different set of validators is to be used. This way, it would be a voluntary process for any node to adopt such a milestone or not.
IMPORTANCE OF THIS IMPROVEMENT:
Fork is part of blockchain ecosystem, even under private environments. definitely it would be very useful if Pantheon had an easy mechanism to fork a network under the conditions previously explained.