EditModePanel is perfect to add your own style or control in the edit mode form of publishing webs.

You can use it to add your own CSS file in the edit mode. 

EditModePanel

Properties

PageDisplayMode
Gets or sets a value that indicates whether this control is visible in Edit mode or Display mode.
SuppressTag
Gets or sets a value that indicates whether this control will render an outer <DIV> element.

more info on this MSDN http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.publishing.webcontrols.editmodepanel.aspx

 

 

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