PTBatcherGUI: preserve project status between sessions

PTBatcherGUI:
The previous request leads me to another question: I am very fond of the pause button (which the hugin status windows don't have, they just have a cancel button). But would it be possible to preserve the status of a project in progress even between sessions? Maybe by writing a partially blended tiff (possibly discarding some work of the current blending step) and making a note in the queue file with which image to continue blending. Or even by keeping the current enblend tmp files between sessions.
OK, at least the last idea would probably require major changes not only in the batch processor but also in enblend - so forget it for the moment.