let just say it like this, and this is from olden days perspective if i'm remembering right:
* Run is full speed walk, 100% analog stick, just pushing W
* Walk is 50% analog stick (or whatever % it actually is)
* Sprint is when you push the in game sprint button, and push W
* I just push W, my guy runs
* I set my walk key to caps, when I push it and W I can do 50% walk. (don't know if walk modifier is toggle or hold)
* I set my sprint key to shift, push shift and W, my guys sprints
If I hold caps and shift and W I have no idea what would happen. I guess it depends on how the XIM interprets that and then if they game even allows you to sprint when you are only pushing analog stick halfway.