Spelling not correct if without vowels

The app is great and intuitive.
However the developer took the approach of teaching with vowels, which is fine except that it is missing some "yod" or "vav" that need to be here when spelling without vowels.
Learning in Ulpan, the app ends up being untrustworthy for me because using this spelling will mean an incorrect answer in an exam.

On another note, I dont always know the shoresh (root), so itd be nice to be able to search by infinitive as well.

nasht00 about Hebrew Verb Tables