Yes, the comicon outdoor map use to good before the inf nerf. Now I use it to PL low levels. It is much safer for them.
If you run the asteroid comcicon then you have the option of afk farming. I tested last night. I cleared it in about 12 minutes afk and less than 5 actively playing.
Yes, that's what I do. Takes more 10-15 minutes. I don't do alot of afk because I can clear in <5 minutes if I play. I can atleast go to the bathroom or get drink without worries.