Python Interpreter Management is a bit of a mess?

I am trying to come to grips with Python Interpreters, and am struggling with the workflow.  Is this common?  What am I missing?  Following is what feels like a laundry list, but is generally frustrating. 

#1 – There is no central interpreter management, but all pushed to the Project level.  Why not let me maintain a list of existing interpreters common to the PyCharm installation?

#2 – Oh wait, there is a list of Python interpreters under “show all” in the interpreter selection dropdown.  This seems very bare bones and is not generally accessible under the PyCharm preferences

#3 - When I attempt to change the name of an interpreter I get an error… “Cannot Save Settings, Please specify a different SDK name”