I like a really 2008 based servers. But all of them are trash, unbalanced and Item shop based.
I will prefer Quests, thaht will help you in progress and leveling.
More metins on maps than the original ones.
An Teleportring with the basic maps is needed!
In my opinion it dont need many QoL.
I think an Offlineshop is an must have.
Maybe an Switchbot. ( If switchers are hard to get, the bot is maybe pointless. )
An pickupfilter is not an must have, but a nice help during farming. (I hate pickup all)
With 4 inventorys I think you don't need any kind of extra inventorys ex book pages upp stuff. If Books are stackable, you can easy manage the inventory.
An 2008 oldschool server needs an lot of love, many testing and less bugs.
Easy to get combat Horse. No one wants to grind for that!
The really important think is the lowlevel. Maybe an specified run, more Quests and a great balance and Im in!