Allow to set the fields mutually exclusive without adding a controlling field, such as a checkbox, dropdown, or radio button.

Have a form with 2 fields.  User only allows to enter values into one of the 2 and cannot be both.

I cannot set this up with a trigger field which is a dropbox or radio button.
However, this trigger field setup does not make sense in plain PDF form and we are required to keep PDF form and docusign to be the same.

There is a condition that we can set on the text box or number box.

It would be very helpful to expand that condition to involve logic like If-then-else and also across different fields.  
Or expand the validation of the field to contain formulas.