The duplicated button detection on the remapping menu is done entirely on the game's C++ code (Lua cannot have any involvements) so probably no. I've found "control_scheme_text.xtbl" leftover in the game's files (download available below), but I'm unsure if it is actually used by the game. It sounds like the Vehicle Surfing timer is accidentally enabled during the Mutiplayer matches. I cannot test anything MP-related beyond the pre-match lobby, but I've created a modified hud.lua that disables Surfing Timer during MP (download available below). Hopefully it works.