Is it possible to include JavaScript inside textarea?

Do any of the supported editors allow JavaScript to be included in the page via textarea?

I’ve taken TinyMCE for a spin and added the following options to _config.inc but it keeps wanting to tangle with the JavaScript.

entity_encoding : "raw",
extended_valid_elements : "script[language|type]",
verify_html : false

Has anyone had any luck with this? Thank you!