I agree With Mirai, just broadcast directional movement keys. If your toons get out of sync, find some corners along your route where you can run them all in to. This'll put them in the exact same spot again, effectively re-syncing them. It'd be much harder to resync your toons if they are facing in different directions, and even if you got them in the same spot, they'd run off in different directions unless you manually turned them to face the exact same way.