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Editing a block of code from inside the config dialog (and storing it in the config file?) seems a bad idea because you lose all the power of the normal IDLE editor.
Instead, you should edit the startup code in the editor, save it to a file and point the IDLESTARTUP or PYTHONSTARTUP environment variable to it (http://docs.python.org/library/idle.html#startup).
[Unfortunately, these envvars currently don't work after restart; http://bugs.python.org/issue5233 has patches to fix that.]
What does make sense is having a way to set the startup file from the config dialog, instead of environment variables. I suspect nobody cares enough to implement this if you don't.