I do find this 3 post rule very useful,nice,wonderful,exciting,great

Lets assume one wants to have the players view follow an entity of type unit which was assigned a command earlier.
The way to do this is to have an invisible player entity and to do a teleport to the coordinates of the unit on each tick.

It would be cool to be able to do this in a more convenient ...

The problem is that there is currently (in my opinion) no comfortable way to see whetever an unit has finished its command and how it finished it.
I don't like having to poll LuaEntity::has_command() or LuaUnitGroup::state.
So a on_command_finished event would be great, maybe with parameters of kind ...