Here is Prof. Banfield's quite extensive answer to my email. This is an automatic translation, slightly shortened and edited by me. Blame me for any remaining awkwardness, not Volker Banfield!

'To answer your question: at the beginning of the Pejacevic project there were detailed discussions with the cpo music chief and this combination was selected after some back and forth. I then found that the piano concerto is very conventional and not so interesting as the Fantasy. Dora has indeed started very naively and only gradually found her personal style, a natural evolution, which unfortunately was cut short by her early death. As far as the piano sonatas are concerned there is a similar analogy; I had selected for possible inclusion only the last sonata (which did not fit but on the CD). You will forgive me that I am no ‘catalogue pianist’, who records everything without a critical view. I also believe that one doesn’t do composers always a favor, if one presents less successful works to the public.
CD productions (especially with an orchestra) are very complex and expensive and we will wait and see how this first CD catches on and is sold. The last word in my view is therefore not yet spoken. But keep in mind that the Piano Concerto fills no CD and it would therefore be necessary to discuss more works for inclusion. I will soon meet with the cpo music chief to discuss possible future projects.
Finally, I would like to point you to a CD with older ARD recordings, which was produced one and a half years ago by Venus (unfortunately now bankrupt).
http://www.banfield.de/html/disco/frame.html.
With best regards,
Volker Banfield'