Outlook 2010 Add-In: How to customize "From/To/CC/Subject" pane?

I'm currently working on an Outlook 2010 Add-In with C#. Is there any way to customize the "From/To/CC/Subject" pane in Outlook 2010?

Specifically, I hope to implement the following functionality:

1. Add a new field below the subject of an email
2. Add two icons on the right of that area

I need to do that both for email previews and when read开发者_开发问答ing an email in a new window. See this ImageShack pic as an example.

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You cannot customize this part of the Outlook user interface - as of my researches I've done for a client who just requested that. Here's my link list (with negative results):

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