2) Yes, I have been using my BPM of my Nikon D5100 for more than three years with excellent results.
APP wil detect whether a file that is being loaded is a master calibration frame or not. So you could use any load button to load the BPM. It will recognize it’s a BPM and use it as such. Same holds for the other master calibration files. The fits header information is used for this, which you can check with the details selectbox above the image viewer.( You can also see all meta data of DSLR RAW frames.)