Thanks Dave480, seems to work. Although it‘s not the way it was designed (e.g. you should never press the „real“ Off button when using this „feature“) and I had to rewrite some of my Home Assistant automations. But thank you anyway!

I fully agree, not being able to use the buttons outside of activities is the biggest drawback on my X2 yet. I need it to activate lights, A/C equipment, curtains etc. _before_ starting any activities! As it is „just software“, please give it a chance for implementation!