So consider this, SCU's are piloted by a human or seraphim even though, except for a couple features that engineers don't have access to, they behave like any other unit. In other words, it's completely arbitrary to the player whether or not there is a sentient being inside of the SCU.
Now what if you had a mode that was like assassination EXCEPT if your ACU gets killed then you would still be able to control your units as if it hadn't died because the in-game explanation would be that the pilot of the SCU has taken over command. Finally, there's an actual point to bringing actual humans and Seraphim into the battlefield.
SCU's at this point are definitely a late T3 option and so you wouldn't have people being reckless with their ACU's in T1 and T2 and once they get to T3 it would serve as insurance against strat bomber and other forms of snipes.
You would need to balance this of course. Maybe make the ACU death explosion do more damage to the player's own units/buildings, limit the command transfer to the first SCU you build (so that if you lose that one, no more second-in-command), or other balances to lessen the numbers of SCU's. Without balancing, the code would be simple, it would be just like supremacy except it wouldn't include engineers.
What do you guys think? The one problem I see is that without the risk of game ender, I'm sure you would see a lot of reckless ACU teleport usage, but maybe that's not such a bad thing, maybe cybran acu laser shouldn't be for decoration. What do you guys think?