KristianS Yep, figured you'd say that 😄
Just not sure it's intuitive enough. But could work. Bit worried this would end up with a 4th state, export...
Perhaps it needs a 'View mode' dropdown. Import as default, and a Hold view, which would allow you to select slots that aren't already charge slots.
4 states (Eco, Import, Hold and Export) could also pave the way for a Smart Agile ROI optimiser (PredBat lite) which would set all these 30 min slots up for you.