@G-Sun
Thanks
You can prevent colorization of items by deleting the line
REAPER-ReaScripts/X-Raym_Group selected items according to their order in selection per track.lua at master · X-Raym/REAPER-ReaScripts · GitHub (or maybe it is the line above, I messed up with the commentsn but one of this action has to be deleted to prevent colorization --').
Let me know if it works for you.
@deeb
Thanks !