Is this considered a mobility issue?

[DisneyOma]

No sitting doesn't relieve it or keep the pain at bay. The main goal is constantly moving/walking. Standing for 15/20 minutes is fine b/c I can pace a little or sway back and forth. Sitting in one place for a long time repeatedly also bothers it so that's why I don't think a wheelchair is the right choice. The only way to truly prevent it is walking around or laying down. The long ride wait times (over 30 minutes) is what I'm most concerned about and once it hits there is no relieving the pain unless I'm laying down.

I've never had to stay in one place in a queue for 15/20 minutes, so I think you'd be okay in the queues. The only place I can think about is a bus queue if you don't have anyone with you - if someone is with you they can hold your place in the line while you walk around. DAS doesn't not work for bus lines or food lines.