As Sam wrote currently no skinner on the team but every improvment that people want to do on the skin is welcome.
For everyone else if you a desparate just open with an editor
/usr/share/kodi/addons/skin.osmc/colors/defaults.xml and change <color name="ColorSelected">fff1f1f1</color> to <color name="ColorFO">fff3f3f3</color>
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