I’ve never had a designer send Qs to me in an electronic script, but have occasionally had them loan me their script with hand-written in Qs to copy. For me personally, I find that easier and more error proof than entering cues from a list, and having it in digital format would only help that. What are your concerns with this method? I would not assume the designers are asking you to call from their scripts, if that's the concern. Although it might waste some paper, I would print out the designers’ scripts, and write their cues into my script going page-by-page.