You can change the AI-updates per second wich IIRC will make the game go faster.....
but this will not only affect walking speed, but also game rounds, enemies speed etc.
You might also want to set the pathing AI as high as it will go. It was notoriously bad for the first release, and you could quickly end up with six characters running off in different directions no matter where you've clicked as their final one.
__________________ To the Righteous belong the fruits of violent victory. The rest of us will have to settle for warm friends, warm lovers, and a wink from a quietly supportive universe.