[itsme]

I don't want to argue with anybody.
I use complete fakebooks, but I discarded my original idea of importing the whole fakebooks into MSP. I found a workflow that works almost perfectly for my needs without overcrowding my MSP library with thousands of songs, only using existing functionality.
Here it is:
Step 1:
I copy a selection of my fakebooks on the tablet. For every fakebook I create an album of the same name in MSP and add two "songs" to the album, one for the fakebook's table of contents and one containing the complete fakebook (PageOrder 1 - last page).
=> the books are accessible in MSP by looking up songs in the TOC and navigating to them via MSP's "go to page". For songs that I plan to use I create new MSP songs by copying an existing one from the respective album and adapt the title and page order. Not very comfortable yet, I would have to open the TOC of various books to find a specific song, just like using paper books...
Step 2:
I merge a list of all songs of all the fakebooks on the tablet into one XLS file that I also copy on the tablet.
=> I can look up a song in the XLS and find the right fakebook PDF and page order to copy paste it to create new songs much faster as above
Step 3:
I create a CSV for every fakebook and copy it into the same folder as the PDF on the tablet
=> voila. The library contains only those songs that I really need. Thousands of songs available on the tablet that can be added fast and conveniently: looking up the right fakebook PDF  in the XLS then open the fakebook's CSV with MSP's CSV import function and select the song in the following song selection dialog