I'm strongly interested in the prefill feature without the need of a mkt_tok. I already saw that @SanfordWhiteman offers a pretty cool and easy way to make this possible. (https://blog.teknkl.com/pre-fill-any-site-any-form/)
As well I think "Progressiv Profiling" is a pretty handy thing. But is there any way to combine thouse both? So to prefill the form yourself and let the form react on this? Or is there a way to change the progressiv profiling fields your own using JS?