I think the new and long awaited Combat pace should be the default speed for the character.
Obviously the controls should be renamed accordingly.
These are my suggestions for renaming the movement speed keys:
Walk/ Toggle walk (now called "Walk or Run")
Run / Toggle run (now called "Combat pace")
Sprint / Toggle sprint (now called "Turbo")
As an alternative , an option could be added to choose the default speed between Walk , Tactical pace and Run (Sprint excluded)