Yes I have TwistedMexi's "enable all cheats" in and yes, it said cheat enabled. - But here comes the news.
I repaired the game again, created a new save file, testingcheats on, no mods, tested shift-click on sim and plant and it worked. Ended the game and reloaded it, tried same thing again, not working! This is a really nerve wracking experience. Never had that before. Something must be wrong with the cheat without the cheat file from TwistedMexi. What else could it be? Guess I will make a complete re-install of the whole game. - Not sure what to do with this thread now since it looks like I'm the only one with the issue 😕