No, the percentage levels of zoom or unzoom are set and can not be modified (as far as I know)
That is part of the reason to know the minimum, average, and maximum screen size of the computers you are designing a database to operate on.
I had a funny feeling that was the answer. Just have so much information that has to go on the one screen that being able to have 125% in between the 100% and 150% would be so much better. FileMakerPro-give me 125%!
Appreciate your response, David.