[itsme]

to 4.)
You can create and populate collections, albums, genres... as you like. It requires not only the title line, but additionally populating the whole column with the desired value(s). For examples see http://zubersoft.com/mobilesheets/forum/...p?tid=3276
to 5.)
I always add the title of an imported songbook to "Albums" so filtering by album is a snap. As soon as all songs of an album / songbook are selected by a filter "select all" can be done by selecting one of them via long press. Then all songs can be checked in the little box at the bottom right. Note that "Delete Song Pdf/Image/Text Files" is only available when you delete from the Songs tab and won't delete files that are referenced by more than one song. Deleting from Collections, Albums, Setlists and so on will only remove the song from the respective group
to 7.)
That looks like a bug. It works fine for me on Android. There seems to be a bug on windows, see my next reply.