would it make sense to index in parallel when different physical drives are involved?
Everything should be doing this already.
Everything will use a separate device thread for each physical HDD.
Everything will use several threads for SSDs. (on Windows 10+)
Current threading mode is shown under Tools -> Debug -> Statistics for each drive.
If set to Separate device thread, each unique Disk device index will get its own thread.
you display the filename in the Options | Properties window as the indexing progresses
maybe also include the driveletter:<sp> ?
Hover over the short progress status with the cursor to view the current full path of the file being indexed.
A progress bar is also shown in the main search window status bar.
Hover over this with the cursor to view the current full path of the file being indexed.
i didn't bother checking, but can Include: / Exclude: Files accept a filter; like audio: ?
Unfortunately, no.
audio: is not well defined.
You'll need to specify exactly what you want with a semicolon delimited list of extensions.
For example:
*.wav;*.mid;*.mp3;*.flac;*.ogg
If this changes, Everything will need to reindex.
Only files matching these filters will store the desired property, making Everything property indexing memory efficient.