Board Game Arena

Hey.
It seems like multi-steps undo option works fine, at least for me. Unfortunately, enabling this option enables the friendly mode.
Any roadblocks / concerns to make it a normal default option?

Can anyone explain how to play the Research Coordination card? I've heard this can be played against Builder, for example, but how?

Inis, please

Also: dorfromantik, zombie teenz, andor junior.