I feel comfy with the idea as it is implemented today. If users have to remember too many keys/passwords they start reusing them. So every reused password adds security.
However, on touch keyboards there is an additional barrier: the limited set of keys - thus entering the correct key tends to be complicated. This can be overcome by using a clever keyboard (I use the Hackers keyboard) or by selecting a password that has 3 or
4 charcters that are simple to type. To be on the secure side it might be better to adapt the password and use Keepass2Android own keyboard.
Please note: I use this on a tablet. Due to less comfy entry on smaller devices such users might have a different oppinion!
While I think todays way to select keys is fine I propose the following changes:
- remove the green key and autoterminate the field after the given count of characters (3 or 4) is reachd
- change text text in Settings: it is not 'maximale Anzahl'. Just 'Anzahl' is correct, as the length is fixed