You can right now! There is the QTR Curves Tool. We do not use it ourselves but many QTR users use it daily! There is a manual for its use on the qtr website.
We produced our own profiling application which does not use the same format, etc.. but we compile the results out into a format that QTR can read called the .quad file.
We produce a free library and offer custom curves services. There are some limitations to the QTR Curves Tool. For example, the curious shape of Piezography Curves is not available in the QTR Curves Tool. Our shape greatly increases resolution as well as smooths out crossovers and totally eliminates dots.
Having said that - it does not mean that you can not create your own curves, etc. We do not discourage you. We just tell you that we have a very high standard way of making these ourselves and that the time and money spent trying to imitate the results may be better spent using our custom services.