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Several areas for attention:
* Changes to the test suite probably should not be made
 The user doesn't benefit in any way and you risk
 unintentionally breaking the test suite in a way that
 isn't obvious (we have no tests for the tests themselves
 so changing tests is like refactoring without a safety net).
* Some of the exception handling in IDLE needs to catch
 all exceptions (i.e. SystemExit and KeyboardInterrupt
 are supposed to display tracebacks and not terminate
 IDLE itself).
* Changing the exceptions in threading.py is worrisome.
* The Pdb debugger may have legitimate reasons to catch
 all exceptions (like IDLE, we want don't want to 
 terminate the debugger itself).
In other words, many of the proposed changes should not
be made. 
For the rest, be careful to not change semantics
unintentionally and consider adding tests if you think
there is a real bug. In cases where there is doubt
about the right thing to do, consider assigning the
original author or maintainer of the code.