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It would be nice if using the fancy editor window was optional for all modules. Unfortunately it isn't.
What you need to do is change all occurances of
new XoopsFormDhtmlTextArea($caption, $name, $value, $rows, $cols)
to
new XoopsFormTextArea($caption, $name, $value, $rows, $cols)
This would be found not in the templates but in the module php files which define all the fields for the forms and typically handle submitted information.
I hope that helps and isn't beyond your skills. This would be a big hack if you have lots of modules using this form.