Shift to suspend snapping doesn't work for right click marquee time selection

This might be by design, but I find myself constantly trying to hold shift while drawing a time selection via right click expecting it to let me draw a selection off of the grid but it doesn't work. If shift is supposed to suspend snapping I think it should apply to this situation as well no? Currently the "suspend snapping" seems to only apply to moving items and trimming their edges, should there not be a way to have this apply globally to everything? A modifier combination where the snapping button on the toolbar literally changes as soon as you hold it and changes back when you let go?