Well on one of UBer's Newest Livestreams, they show off a debug/sandbox mode where you can just spawn in units. Is this in the newest release? If not could Uber PLEASE add this as an option in the game. That would be awesome. Also here is the link to that video: You can see this menu around 8 minutes in. THANKS
We've already talked about it over here; https://forums.uberent.com/threads/planetary-sandbox.59042/ Mike
As was mentioned, it's already been talked about. Please use a search before posting. We'll have access to this upon game release.