When you manually enter a measurement in the craft editor (such as tank width / depth), on Android, a normal keyboard is displayed.
A lot of other apps show a numbers-only variant when seeking numeric inputs. This would be awesome, as it would save taps.
I use the numeric entry a lot for precision, especially after auto-sizing causes a tank or other component to become skewed in a manner that no longer conforms to my preferred 0.05 grid.
Even some other aspects of your UI show the numeric-only keyboard, so I know your devs understand how to implement it.
Ignore the attached screenshot; the game wouldn't let me capture the keyboard in its built-in screenshot grabber. I think this bug is pretty straightforward but if you need a better picture let me know.