If they want to integrate backwards comptability with old Amiga software, I think one thing they out to think about is adding new features to the File info, for example, if you have an ADF file, and you click on it, it will know to launch up an (invisble) session of UAE, which will auto load into it's own window, I.E. you click on a ADF of Shadow Of The Beast 3, and it loads. But then there are compatability issues to think about, and so you should then be able to right click on the ADF file to goto its info, and set the UAE parameters from with there, close it, and launch and all is well...
Of course there would have to be a standard default so you don't have to do this every time. Something like a stock Amiga 500 with 1Mb chip RAM or something.