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About your first question: yes, it’s possbile.
We’re using FCK like rich edtior in every textarea.
I’m not sure in the last vesrion of Magento, but using Magrnto 1.0.x and TinyMCE, there were a compatibility problem.
You need to modify the /lib/varian/data/form/element/textarea.php file, and add the FCK call to the textarea.
I’m not sure, but I think that there is a reference into the forum.