Sounds like a good future update for this asset. Something like ap_grid_add_tile_layer(...)? And mask out specific tile ids as walls
Viewing post in PathForge: A* Star Pathfinding Toolkit comments
Something like this. I can recommend You Pixelated pope's collision tutorial: https://gamemaker.io/en/blog/precise-tile-collisions-by-pixelated-pope -You can check it for precision reference.