Was thinking a bit about stamina recently as well. I am curious what it would be like if sprinting had its own stamina bar separate from the stamina consumed normally, and the only way it would replenish after being consumed is over time. Perhaps there would be some level of skill or strategy involved in using or conserving your sprint stamina.
It might also be interesting if equipment and/or inventory weight did have some kind of impact on stamina consumption, whether that's sprinting or normal stamina consumption or both. I know it's been suggested before that equipment has an impact on speed, and for obvious reasons like automating equipment switching mid-combat that isn't the best idea, but maybe that would be less of an issue if it affected stamina consumption instead.