Hello,
in Czech keyboard we use special letters like "ě, š, č, ř" etc. Thank you ver much for implementing this feature into your keyboard, so we can write in czech language. I have a suggestion here. On normal PC keyboard, these letters are the same keys as numbers on english keyboard, which is ok. But I think there is no need to follow this on phone keyboard, since writing style is different and it would not be confusing, if number would be elsewhere.
My suggestion is to put numbers under "qwerty" line instead of this special characters line for three reasons:
1) Qwerty line is "lower", so it is better accessible and it would be easier to write numbers
2) For those who use another keyboard language (I, for example, use EN and CZ), it would be less confusing when they switch between these languages (when I switch from EN to CZ, I unwittingly search for numbers under qwerty line)
3) Since special line has special characters, which are optically higher (Ě, Š, Č, Ř...), small numbers above them, signalising I should write numbers by long-pressing the key, are somwehat placed "over" these special letters (they just don't fit on the key). But this is just cosmetical aspect, of course.
The "qwerty" line is free, so it should be no problem and like I said, I think it shouldn't be confusing as well, since writing style is completely different (on physical keyboard, we use shift+key or numpad for writing numbers and it's automatical for us, but on the phone, it's completely different).
In case somebody may be confused by this change, I suggest possibility to move numbers from under "special" line to "qwerty" line.