Scratchpad eraser and ideas

I use kahn academy on my tablet (ipad air) and have started using the scratchpad feature alot and find it very useful. I do have a couple of comments. When i make an error or want to restart my calculations, the eraser ✏️ only clears a thin surface area where i swipe. It would be really helpfull if it cleared the connected mark and if it could clear the whole screen or make a box and delete anything in the box. Would be advantageous if it could also copy and paste like in Sals video. It also has a bug that when the tablet is tilted to the side and back again, an inch size strip down the side is unusable. It also stretches, reduces and does funny things with the written text when tilted. Would be great if the scratchpad was available when doing the reviews for the test questions at the bottom of the page, next to the home button on the control centre / task bar at the bottom of the screen. Thanks