Hi @dmladenov,
for remotes, in libreelec 10 the driver used is the legacy one because it integrates switching off/on. Which you can't do with the mainline driver (you can manage the suspension, but not with which key/remote control to reactivate everything).
The legacy driver is taken as-is from the 4.4.x kernel and therefore the mapping is not easily modifiable through the official libreelec guide because they reside in the device tree (like android os).
You can modify as you saw the dts with the scancodes you prefer (the module has a debug mode where you can view them).
In libreelec 11 I plan to use a mix of opensource drivers/legacy suspension system, but I don't have much time for new developments these days
I'm sorry
Michele