Here is a way how this can be done: Changing Tech Costs in Scenario Editor carries over to Multiplayer and Desyncs Game
The guy who posted it initially wanted it to be more secret, but did not get recognized, so I think I am fine with linking it.
Even if this was fixed we can still desync by changing the packages that our PCs send to the server. This would need way more programming than now, but still would be possible, because the servers seem to only be broadcasters (this is a assumption by me, based on how the game behaves), not really a gameserver (which actually plays the game, to verify which version is the true one and could detect a desyncing/cheating player (this would be expensive to run, and really hard to develop, but was what I expected when they introduced serverbased playing with DE…))