This is short but most people don't think about it. You should make it so that ranks can't go afk for longer than one hour, while non-ranks have 30 minutes. Also this is really annoying when I see non ranks afk for 8 hours and I can't stay on for an hour actually doing stuff.
I agree they really need to have a limit on how long you can afk. I know it was pretty bad about a month or two ago. for the gen 2 servers. for one they only had two servers. Which were hard to get into in the first place. But when I did. I saw at least three people afk at pokestops for hours. But glad to see they added a lot more servers to gen 2. Which it needed badly. But all servers still needs an afk limit. No matter how full or not full a server is.
