I've suggested eons ago for the feature of being able to play and gain xp in any and all maps, with the unstated assumption that the mobs and bosses will be scaled accordingly to keep things challenging and interesting. The current implementation, where I can let my friend's 2 year old play my end game toon in forest haven and still gain xp and kills, is just outright ridiculous.

Let's cut through all the pretense, sugar coating, and BS and call this what it really is: selling xp for plat.

So my suggestion to STS is to scale the difficulties of mobs and bosses to the host, and if others are outside of +/- 5 levels of the host, then they don't get any xp or kills. This would give access to all maps while keeps things in balance.