Hello!
A function I'd find very useful is the option to not add discnumber if only 1 disc is present. Right now, if there's only 1 disc (and I keep discnumber active) it adds 1 (or 01 or 01/01, depending on options).
If I had an option like "Don't add discnumber if only 1 disc", I could keep the discnumber always active instead of turning it on and off when I batch tag my albums.
Thank you!
Right now, you could still use the numbering assistant,
then filter for
discnumber IS 1/1
and delete the field DISCNUMBER.
A word of caution: once you add a field with data, but then remove it again, you can never be sure whether you already treated that file or not. The same would apply if you don't write 1/1.
Hi and first of all thank you for the answer.
Yes, I know I can do that but it would be easier to have an option. 
Also, I'd really like to have a "Reset counter" as for track number.