I have a suggestion for improving the feature of clicking the graph once to get the 3-slider mode.
Right now, 1 left-click on the graph brings up the "advanced" three-slider mode, and clicking that area again starts the 24-hour preview. This doesn't feel right. It feels like left-clicking that same area again should switch back to the 1-slider mode.
So, I think that right-clicking should be involved here somehow so that the mouse cursor doesn't have to be moved when the user wants to switch to the 3-slider mode and then back to the 1-slider mode. Perhaps it should be so that left-clicking starts the preview, but right-clicking toggles back and forth between the 3-slider mode and 1-slider mode. In other words, perhaps right-clicking is the only way to toggle back and forth. Or, right-clicking is the only way to start the 24-hour preview while left-clicking toggles back and forth between the 3-slider mode and 1-slider mode.