I would think in an RTS game, you'd only send the mouseclick position, and let the local pathfinding do the rest. As to the data for each little entity(health, ammo, ect.), sending to comps that only need it would indeed help. But mabye you can find a way to detract health and the such locally, and still keep it all in snyc. After all, when you delete an entity, it will delete on all comps at the same time. Just make sure when their attacking eachother you display the effects, and mabye a mock up health bar(while only doing the real health work on one comp).