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Mac/IDLE contains support code for building and installing an application 
bundle for IDLE, which gives us a nice icon to click on :-)

Detecting the platform and automaticly using platform-specific settings 
would be nice and would mostly solve my problem. "Mostly" because config-
extensions.def also contains key-binding definitions; which could well be 
platform-specific (AquaTk doesn't seem to support the ALT modifier).

IMHO the current workaround is crude because I maintain a seperate copy of 
several configuration files just to change a small number of settings.  I have 
lowered the priority of this issue because I don't think this is very important.