Some Questions About Mechanics

A month or two back I was playing and I overheard a Johnny Reb tell a newer player about stamina. I heard him say that, while sprinting on the Double Quick, you should keep your rifle shouldered/you should not have it down as if you were charging. This way, you sprint a little faster, or maybe he said that your stamina drains less quickly and you can run a longer distance.

I have also heard that you reload quicker while having your momevment set to Quick Time. It only shaves off a second or so, but still, the game takes place in a time where it took several dozen seconds to pop off a round. (Also, I wonder, does having a higher level help with anything, or is it just a level? Do you reload faster, aim better?)

If anyone can answer these questions, thanks.