I am using the simulator on Linux (Fedora 34, inside a VM if that matters at all), and everything works except the mouse wheel cannot scroll the crank positions. I tried using a mouse and the trackpad two finger scrolling, but none works. The other UI components (e.g. Lua Memory window) can recognize the mouse scroll, though.
Interestingly, when I put my cursor on the crank degree input box, it scrolls fine and controls the crank. But after scrolling there, the simulator no longer recognizes any of my key presses no matter what I do, and I have to restart the simulator.