enable the option to expose the rel attribute to the node edit form

It would be nice to expose other attributes to the node edit form, particularly the rel attribute.

One use case for this:

If I have a link field in a custom content type, some of the links would load a lightbox and some wouldn't. But the editor wants the freedom to choose which links open the content as a lightbox. If the field was exposed they could simply add the lighframe[|width:290px;height:290px;] to the field and they would have control of the size and the freedom to choose when to use a light box and when not to.