How to make an element in a TinyMCE editor treated as a non-editable single item?

Question

Within our CMS, our users can edit error messages for forms using TinyMCE. The problem is, some of these messages may require dynamic data, e.g. \"Your chosen name \'X\' i

Answer 1

As a duck-tape programmer, I have to ask - can't you use an image? I think TinyMCE used smilies, maybe you can replace those with "elementies" and allow customer to insert them and on save convert to tokens.