Deprecate running IDLE without a subprocess

IDLE developers,

In the interest of simplifying IDLE's code, I suggest that running IDLE 
*without* a subprocess  be deprecated. Since 2009, IDLE could have 
multiple instances running while using a subprocess. See 
http://bugs.python.org/issue1529142

Running without a subprocess has a flaw in that Ctrl+C from the IDLE GUI 
can not be used to stop a program. This can be irritating to Python 
beginners if an accidental infinite loop arises and the user's only 
recourse is to restart IDLE, losing any unsaved work in the editor windows.

What are your thoughts?

- Roger