I think that add-on only allows for assigning a different action. If one wanted to just disable the key then they would need to manually keymap the noop action…
<keymap>
<global>
<keyboard>
<volume_down>noop</volume_down>
<volume_up>noop</volume_up>
</keyboard>
</global>
</keymap>
Introduction
This guide is intended to serve as a reference for users who want to modify the button behavior of their OSMC remote controls. This is not intended as a general guide on key mapping in Kodi, or a thread for general keymap questions. If you need to familiarize yourself with keymaps, or what things you can do with them your first step should be Kodi’s wiki on the subject .
OSMC Legacy Behaviour
The first two generations of the OSMC remote using OSMC prior to the March 2020 update …