http://iscoresports.com/

This may be an feature request but it's also a problem. If you hit say inplay by mistake hit the wrong play. There appears to be no way to step back. I guess you could complete it in some way and then un-do and then go forward again but that seems like an awkward workaround.

Try shaking the device to get a undo popup.

Shaking the device is the correct way to cancel out of entering a play for a batter - it will ask you to confirm you want to cancel.