>Have you experimented with the lock icons under the hotbars?
No, I recall seeing an unlocked padlock symbol but never toyed with it.
>How often do you press Q
Sometimes, it's not really in my head to do that even though I'm aware that's how it works
>How often to you press mouse3 to quick-pick a block?
Very often. In fact, rather than searching the inventory, it's much easier to open the guidebook and middle-click pieces from the guidebook to find items because it's pretty hard to locate items in the inventory/hotbar. I don't think I really use the hotbar, I just middle-click if I want anything.
I don't know if I'm doing things right but it works (Edit: I'm not, I set up the capacitor without a potentiometer and I've found out that I'm mistaken in thinking magnets stop actuators from pushing)