I know AGK-S has clickable buttons, but how about just clickable zones, that are invisible to the player. This would be useful in Visual Novel type games, for example, where you might have a note on a table in a 3D rendered image, and if you could define a polygon zone in the scene editor, around that note, and click the mouse, or key, you could jump to a function to show a sprite and read it, play a sound or print a message on screen for example.
I don't know if zones are in AGK-S, I can only seem to find collision zones between sprites.