0x80F28E95), not as letters. To use another key, copy its hash from the tables below into the config, in place of the old one, and restart the server.
A hash is a game action, not a physical key: a player who changed his key bindings in the game’s settings uses his own key for it. And a key only works where the game reads it (on foot, on a horse, in a vehicle). If a key does nothing, look at the last column of the full list of RDR3 controls.

