We constantly run into this issue at the office where we have questions that would mostly be suitable for grid formats, but that also have a other(specify) option. The way sawtooth seems to handle is that it puts only one text box in either the column or the row, as opposed to putting a text box in each row of a column for example.
As a result, we often spend far more time than we should making separate multiple choice questions as opposed to one big grid.
From my understanding, you can program a free form questions using HTML to allow for a combination of radio boxes and open text. Sadly, nobody in the office is familiar with HTML or programming in general. Would any of you be able to kind show me a sample code of what this kind of question would look like that we could use in the future or at least that would form the basis of me learning to make one myself?