Ive got a solution
It would take some effort on the part of Disney, but it could work. The concept involves chair tags, which would be connected to your room. Heres how it would work
You go to the pool, find the chairs you want, remove the removable tags, and take them to the lifeguard. The lifeguard takes the tags and puts them into a cubbyhole with two smaller tags hanging in front of the hole. One tag (the claim check tag) the lifeguard gives to you, and the other tag (the status tag) is used to identify if you are in the pool area (green side facing out), or out of the pool area (back of the tag facing out). Before you leave, the lifeguard swipes your room key, and assigns the tags to your room. The chairs are now yours!
Of course there would be some rules. You could leave the pool area, but for no more than say 30 minutes. There could also be a rule limiting the number of times you could leave the pool area in a day. There would need to be a penalty system anything from removal from the pool area, to a fine charged to the room. Finally, the lifeguard could also do random spot checks if you have left the pool area and did not check out, then a penalty would be imposed.
As an example, say you need to step out of the pool area. As you leave, you show the lifeguard your claim check tag. The lifeguard takes the matching status tag from the front of the cubbyhole, writes the current time on the back of the tag, and then hangs it in front of the cubbyhole with your chair tags, time side facing out. Off you go to do whatever you need to do. When you return to the pool area, you show the lifeguard your claim check tag. The lifeguard takes the matching status tag from the front of the cubbyhole, and checks the time. If you made it back in less than thirty minutes, he erases the tag, and hangs the status tag back in front of the cubbyhole, green side facing out. If you are late, then you loose your chair privilege for the day, or face some other penalty.
Now lets say someone comes to the pool, and there are no empty chairs. The lifeguard could use the tag system to find out who has been out of the pool area over the thirty-minute window. Then the lifeguard could give their stuff the boot, send it back to their room, and impose some other penalty. If the lifeguard cannot find a violator, he could do a spot check, starting with the oldest time, until he finds a violator.
And if someone uses someone elses chair, the tag system would settle the dispute!
I know it sounds complicated, but it could also be used to rent chairs for the entire day, or by the hour.
Just a thought!