A collection of many things, mostly metal and rock, with rare additions of really weird stuff.

This would be useful to create a variant of an existing smart playlist with minimal changes. For example, to take a nontrivial smart playlist, and make a copy which also filters everything by genre or something like that.

I thought it's possible to do so by manually editing strawberry.conf (section [SerializedSmartPlaylists]), but after I try to edit the copy, the changes are not actually saved, so it's not actually helpful.

Supporting closed-source operating systems that deviate from Linux in lots of important ways is a work and often relatively unpleasant work.
I'd imagine it would have been easier to just drop it and keep it Linux only.
Also, foobar2000 still exists.

What makes it complicated is that BPM can change across the recording, unlimited number of times. So should it store the "average" BPM in that case? And how should it be calculated if so.

Not sure, I've since moved away from using cuesheets (they make a number of other things inconvenient as well), and I did not ever notice anything like this when cuesheets aren't involved

I've not noticed anything like this, but I'm interested in storing this information and so it would be smarter to try to do it the right way.
I think it needs to be a list of https://en.wikipedia.org/wiki/List_of_ISO_639_language_codes, could be named "Languages".
On the other hand, it's somewhat common to have songs in made-up languages which wouldn't have the language code, but is there any interest in supporting them?

Shortcut for "Increment playcount" in the context menu for the selected items in the playlist — could be very useful in combination with the (already existing) search term by play count.

The FLAC file in question verifies correctly, so it's not just a broken file.
I'm unsure how could I possibly report it, since I won't have legal rights to share the file that's causing the problem, but maybe there are things I could do to diagnose the problem? Does strawberry leave any traces when something like this happens? Or are there any particular settings which could remedy that?

P.S. if I split it into pieces (with re-encoding to FLAC again), then it plays fine, so maybe it's not some intrinsic property of the sound recording itself, but something problematic with the format usage, or the fact it's using a cuesheet, I don't know...

+1, this is also useful with certain kinds of crappy hardware and sound backends

A collection of many things, mostly metal and rock, with rare additions of really weird stuff.

This would be useful to create a variant of an existing smart playlist with minimal changes. For example, to take a nontrivial smart playlist, and make a copy which also filters everything by genre or something like that.

I thought it's possible to do so by manually editing strawberry.conf (section [SerializedSmartPlaylists]), but after I try to edit the copy, the changes are not actually saved, so it's not actually helpful.