I'd prefer to see nonrefueling, but with totally open tyre choice, this would really bring strategy into play. I think some of the best races I remeber as a kid had people 0 stopping way out in the lead being hunted down by seconds a lap by 2 & 3 stoppers. This would really make it a fairer competition IMO, as people who are v good on their tyres won't be forced to pit by rules, and people who are generally v fast but hard on their tyres could just fit the soft option and rag their tyres. I think Pirelli would also be quite open to this, as it means they could develop a tyre that lasts a whole race, which would be a great positive for them as far as marketing goes.