Yes, 23.976, 24, 29.97, 59.94hz can play correctly in Kodi and Nova Video Player.
You can also map a key on a USB keyboard, airmouse to work with the RefreshRate app in the firmware then you can press this key when in an app eg. MxPlayer, Netflix, IPTV app to manually switch to any frame-rate. If you know the video is eg. 25/50hz(EU) or 23.976hz(US) then you can manually switch to this frame-rate so it doesn’t play at 60hz which will cause stuttering.
Here is also a link to LibreELEC I made, will update it in future