In ooDialog the EditControl represents the Windows Edit common control.
This class should be updated to the XP level for users running on XP. There are a couple of interesting features such as ballon tips and cues that would only be available on XP.
However, there are also a number of Edit styles and messages that are already available in the C functions. They simply aren't documented. Three quarters of the work for this RFE would merely be to document what is already implemented.