I would love to have the option to prevent changes to cells that have been filled in "in pen," other than maybe erasing them.
I never want to change a value once I am sure of it, but I seem to do it accidentally quite a bit (by tapping a cell adjacent to the one I meant to tap, thanks to an intermittent muscle tremor) and if I don't notice immediately it can mess me up completely. 
Even with this small annoyance, this is the best sudoku app I've ever used, so thanks to the devs for a brilliant job. 
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