Make the number row taller/equal to the letter row to avoid mishitting keys!
Please make the number row the same height as the letter rows. When it is shorter, it is super easy to get letters inputed instead of the proper number selected.
[Edit] I only use iPad Pro 10.5". Probably 75/25 portrait to landscape mode.
In the 4.2.2 release we increased the number row and suggestions bar heights a bit in iPad portrait mode.
Note we’ve been asked repeatedly to reduce the overall keyboard height in iPad landscape mode so we probably will not make any changes there.
If anyone has any further thoughts, either for iPad or iPhone, please post here, thanks!
Why not incorporate something similar to Google gmail where one has the option to choose between default, comfortable, or compact. With PadKeys I'd suggest uniform row height being comfortable, then keep current option as default. Maybe there is a 3rd option dependent on another popular request.