Thank you for your positive feedback!
Yes result file support is non-existent at the moment, but there are plans to do the sort of things you suggest. One of the main issues is that result files can be extremely large and NastPad currently reads entire files into memory (which causes it to crash when memory runs out). It is planned to allow large file support via a buffered stream approach, but it is a fairly significant effort on the back-end. If there is enough interest we can prioritize a results file front-end before the back-end large-file support, and simply provide it with a caveat.