As title says, unitcapture should enable recording useractions (or addactions, the thing you select by scrolling the mouse wheel and hitting spacebar).
Maybe using a new different command like unitcapturecomplex to force AI execute commands like lifting objects with external scripts, opening cargo doors, turn on and off searchlights, etc.
Would be extremely helpful for cinematics when you can't rely on other players, for example, but i'm sure there are a lot of other uses as well.