If the issues you refer to are the ones described in the forum thread you linked, they are not related to the topic originally discussed here. Plus, the solution here does not apply any changes to RadEditor with content area DIV.
I suggest you opening a new forum thread with the question you have and provide relevant details about the situation.
On a side note, the paste behavior described in the other forum thread might be an old bug. Therefore, I suggest you upgrading and see if that will resolve the issue. If it does not, open a new forum thread or support ticket on the topic.
Telerik by Progress