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[nvx .]

>>> Where are these custom key bindings stored and in which format?
>>> Perhaps I could just edit the config file and be done with it... ;)
>>
>> It's ~/.claws-mail/menurc
>
> Thanks. Although the respective keyboard shortcut is still shown also for Address Book in addition to being listed for Edit> Select thread, it works as I wanted it to so I can live with that.

Oh, silly me -- I forgot to remove the address book key binding. Now it is all as it should be.

Thank you all for the hints and advice.