Is there a option that allows a fraction (i.e. 4 9/16, 35 1/4...) to be input?

I have PDF forms for my small business that are used to take measurements on job locations, doors, windows, appliances...

I have set the field for "Numbers" but this setting prevents me from using fractions. I am using PDF Expert on the ipad. It would be tremendously helpful and time saving if the field would direct to the number pad portion of the keyboard and allow me to add a space and a slash for fractions.

Any ideas?

Thanks!