Where does AddMovementInput get its speed from?

I’ve been experimenting with using AddMovementInput as an alternative to VInterpTo for letting my dodge roll move the character without relying on root motion. It feels good, and it interacts with physics and level geometry correctly, but as far as I can tell, AddMovementInput automatically moves me at my character’s maximum walking speed. Is there a way to either override this speed, or build custom movement settings purely for rolling? I ideally want a high speed with a springy ease in/out and lower friction and drag, which is a completely different profile than what walking/running would want.