Here is a small usability item to consider: When I add controls via quick add, they appear to be immediately selected, but in fact I need to click on them to select them.
For example, if I add a control, I cannot simply click the arrow keys to move it, even though it appears selected. I must select it with the mouse first.
Similarly, if I want to delete the control, or send it below another control, etc. by using the keyboard, I must first click it. So I am going from keyboard (quick add) to mouse and back to keyboard.
Maybe it’s something you can look at?