Jinkies. Entity.speed wasn't in the docs.
I fixed that.
From the mouth of vecna, Entity.speed is pixels per second (pps). I commonly use 100 for 'walk' and 400 for 'run', although mulitples of 16 would probably be better. I dunno.
As for waiting a tick, are you sure you want the whole engine to wait one tick, or do you just want the entities to not process for a tick?