I think you are correct about EPs - I'm definitely seeing that more these days. Especially less well-known artists who did smaller releases during the pandemic to keep the money trickling in.
I'd say we could have EPs as part of any review/votes process - at the end of the day, people will either see an EP as worthy of being up with the best of the year or they won't.
Singles? I don't see why we couldn't disscuss new singles released. It is new music after all. Maybe we could have a "song of the year" vote at some point.
I'll probably upset some people here, but I've never seen a DJ performing a "set" as something artistic. Like many things in life (building a drystone wall, putting together a piece of Ikea furniture, splitting the atom), I'm sure it takes a lot of technical skill, but I don't consider creating a mix of other people's music as being very artistic. I'd lump this under the compilation bracket, which I'd want to exclude.
As ever, I'm happy to see what others say about all of the above.