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From what I understand of the rule, it's to prevent someone from making objects move in the background?

That's the correct reason, yup.

Weltschmerz had some very light point and click elements in it and was made in Ren'Py, and those screens are assembled using Imagebuttons:

transform explore_size:
    zoom 0.78
    xoffset -1941
    yoffset -110
transform explore_zeke:
    xoffset -950
    yoffset -100
    zoom 0.78
transform train_effect:
    parallel:
        linear 0.7 xoffset 2
        linear 0.7 xoffset -2
        repeat
    parallel:
        linear 0.7 yoffset 2
        linear 0.7 yoffset -2
        repeat
screen explore_1():    
    imagebutton idle "mg" action Call("anywhere_1") at explore_size, train_effect
    imagebutton idle "fg" action Call("anywhere_1") at explore_size, train_effect
    imagebutton idle "door_p" action Call("door_check_1") focus_mask True at explore_size, train_effect
    imagebutton idle "zeke side" action Jump("proceed_1") focus_mask True at explore_zeke, train_effect


screen explore_2():
    imagebutton idle "mg" action Call("anywhere_2") at explore_size, train_effect
    imagebutton idle "fg" action Call("anywhere_2") at explore_size, train_effect
    imagebutton idle "door_p" action Call("door_check_2") focus_mask True at explore_size, train_effect
    imagebutton idle "zeke side" action Jump("proceed_2") focus_mask True at explore_zeke, train_effect

If you're using a different engine, then you can use whichever method is easiest for you. Good luck!