It's possible to right click a distant object to interact with it, and then immediately left click on another portion of the screen to start Shawn walking in another direction. Regardless of where you stop walking, the interactivity dialogue will appear - and you can complete whatever action.
1) Right click an interactive object (like the cabinet by the window, or the piano)
2) Left click to another movable spot as soon as Shawn starts moving
3) Observe the interaction choices appear regardless of location