i think i saw this message again...
they will not ask about any change they implement, the Essence model in KR is veery successful, and yes they are adding features mechanics from Essence.
Why in the world would you like single target? even if you do, there are 4 types of dagger, eviscerator, sayha seer, and you can play every warrior as single target with the right gear... hell, people from Naia play "melee archer", like the good old days ( dont ask me, I saw that on DT shout) so the option is there for you to play the game " one mob at time"
You did not hear? Im pretty sure they are adding catacombs as part of a weekly 10 hour instance.
Now, if I am getting this right, poeple usuallu want something to do when they log in or they sit in front of their screen and all you want it to be in a single location with a single target character killing mobs for 0.0001% ( at best) ? like for real?
Additionally, why do you want to "change" the current map (mobs layout)? You want single target its more than enough the way it is... now, back in the day most classes were single target, and there were catacombs, FoG, stackato, Pagans, etc, places you could pull tons of mobs, but there were only a few classes that you could do AOE dmg with.. DN/titan/FS/ maybe a sorc or sps etc, now mobs are in packs but the vast majority of the classes can AOE... don't you see a pattern here?
Unfortunately, they do not ask forr the changes that they make, you either adapt or move on