In most mmorpgs, this would make sense, unfortunately this isn't most mmorps. There is only so many instances (dungeons) that can be open. This is why even premade, full parties still can wait hours for a instance to be free for them. SE has the timers to ensure that people cannot block that dungeon for hours. Nice ideas, but unless SE adds more DF servers to handle the instances required, the timers will stay to prevent people abusing them.