Some things to think about with sprinting:
Would you do more damage with a melee attack while sprinting?
Do you have stamina that would be used by sprinting? Would this stamina be used in other actions such as attacking? Is there a way to increase your max stamina? Can sprinting for periods of time increase it?
Can your armor or inventory affect your top speed? (Personally I wouldn’t want your amount of items or your armor on you slow you down, I would only like being able to increase your speed through enchantments on your armor) Can your race affect your top speed?
Can you sprint while on a mount? (This would be very cool) Can your mount increase their stamina) Can you attack from your mount? Would sprinting on a mount while firing an arrow cause the arrow to do more damage?
There are loads of things to consider.
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