Lizards with digitrade legs and empty hands can run on all fours
What it gives:
The good: speed boost. I'm thinking maybe 1.5x-1.7x, maybe 2x (but 2x might be just too overpowered)
The bad: Lizards smash into walls and airlocks if they fail to stop before hitting one, dealing minor damage to head with a chance of knockout and concussion (brain damage). Also they can't open airlocks in this mode. Hands become "busy" and they can't use them.
The other bad: One more reason to call lizards dirty animals ("Have you heard? Liggers are walking on all fours. I thought animals belong in the zoo, HONK"); Lizards hurting themselves
Picture for reference.

Discuss, please.