to cancel the next tool purchase you can right click (i think i need to add that to the control tips tbf..) - also you can using middle mouse drag/right click drag to pan the camera if youre using a mouse! but this makes me think maybe it should pan if your cursor goes close to the edge of the screen or somehting)
i'll be putting a patch out tomorrow with a load of QoL improvements which improves the delete box and a load of other stuff!
Thanks for the feedback!