I anticipate quite a few questions like "Can I fly a drone above roads in Xyzia?" and "What is the legal distinction between a drone and a model aircraft in Canada?"
Should these be on-topic?
Proposal: Drones and Model Aircraft
Yes, those questions are very on-topic. Simple clear-text distillations of complex ideas is one of the things that Stack Exchange excels at. "How should I interpret a sign which says...?" or "is X considered a drone in this country/state...? or "is there legal precedence in country X for the application of regulation Y" are all perfect versions of easy questions with either extremely nuanced or hard to find answers.
An analog is that many questions on the SE Home Improvement site, https://diy.stackexchange.com/, either have directly to do with building/plumbing/electrical code or have answers which are modified pursuant to local codes (e.g. how much vertical space do you need between a sink drain and a sewage pipe).
I’m split on this one. Although many would find Q/A on legality useful, what is legal today can easily become illegal tomorrow and vice versa. Hence many answers can become stale and incorrect over time.
My fear is that people do not come back to update answers or re-vote and it would lead to a site with miss-leading answers that could lead to fines or detention depending on your location. This would be bad for this site and stack exchange overall.