You shouldn't have time to put it down

. You're right though, cut roofs are usually nailed, but back in the '80's I watched a gang of chippies finish a cut roof on a new bungalow we'd come to tile, and they screwed it. Why I don't know - time maybe - but it stuck in my memory. I think they'd just fucked up their timing and had forgotten we were coming to roof the place that day (no mobile phnes then). They'd been fitting some Veluxes and there was loads of rafters and jack rafters still to fit. About four of them jumped on it and just whacked everyting in with their Stanleys. By the time they were clearing off the scaffold we were running our first row of felt.
But every job where you use a battery drill today was done with a pump action Stanley not so very long ago.
"Tradesmen" today whose only qualifications are owning a battery drill, a mastic gun and trousers with knee pads in them, wouldn't have cut it back then. And deffo screws and nails were better quality then.