As the title says I'm asking if you could please add Overlay.GetatScreenXY if possible.
Please stick to the plan of not adding more new features to 3.6.
Sorry. I didn't realize (roll). Nevermind.
For the reference, some time ago I gave this a thought, and found that such function will be logically useless, at least unless overlay is overhauled further. I explained my reasoning here:
https://www.adventuregamestudio.co.uk/forums/ags-engine-editor-releases/ags-4-0-early-alpha-for-public-test/msg636658766/#msg636658766
I shall close this thread now. If this proposal would ever come up again, it's better to think these problems over beforehand.