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1) If you go to Settings->Library Settings->Song Title Formatting, you can include song ID at the start of the formatted song title. This can be used to control the sorting of the song list. I would recommend using the numeric sorting option.

Thanks Mike, a wonderful feature!

2) If you tap the dropdown to the left of the search edit field, you can search on song ID. So you can filter on song ID this way.

I do even not have to open the dropdown on ID. It searches anyway. But in contrast to using the custom2-field, the search here does not do a LIKE-search. That means, searching "10" just gives me the ID with explicit "10" while search on custom2 returns 10,100, 101, 310 and so on. So I will use custom2-Field in the future.

Again: Great app!!