Seems like they all just run one general run speed (unless sowed), if you could test and see ( could be me).
I tested repop and restarting server, set runspeeds from 1.0 all the way to 8.0 , and saw no change. Thes was with Omens Dragorns.
Code:
UPDATE npc_types SET runspeed=3 WHERE race=413;
changes all Dragorns