I do not understand well, what the problem is.
There is problem if one tries imput words with some, not all, accented letters. In that case the word is not parsed correctly and is input only part of it.
In any case, it is possible to input +-any word using virtual keyboard.
It would be nice, if Onyx fixes this accented letters' unwanted "feature".
I speak about pdfreader, the new one. In the old one, you cannot input desired word using virtual keuboard while reading book.