Hi Bettina,
I'm a fan of Projected Dates too (for companies that are wired that way) so I was encouraged to read your comment.
Although I don't know of any way to modify the top portion of a Project window (Layout Templates pertain to the "tabs-and-lower" part), if your Planned Dates are not of use to you (noting that you could use Baselines to capture them at a particular point in time), what you could do is periodically set the Planned Dates to their Projected Dates, a bit like the concept I described in As Soon As Impossible.
Regards,
Doug