Runkey mode
When this is set to 1, walking is disabled while auto_run is TRUE.
When auto_run is 0, or this runkey_mode is 0 the player may toggle walk/run (SHIFT by default).
When this is set to 1, walking is disabled while auto_run is TRUE.
When auto_run is 0, or this runkey_mode is 0 the player may toggle walk/run (SHIFT by default).