One common issue I've found in quests is skill requirements that don't really make sense (Why does The Mighty Fall require 72 defense and 79 attack for example?), as well as many quests having had their exp rewards changed into lamps (not ALL quests have had that change, however).
What I suggest is an overhaul that simplifies quest skill requirements to be more in-line with the content of the quest, while also changing the exp rewards from quests to be lamps (so that those of us who wish to complete certain quests can do so without massively leveling outside of our self-imposed restrictions).
Note: I am NOT suggesting that we remove all skill requirements for quests, simply make them more available to lower level accounts, even if that means it becomes a more challenging quest if you just hit the required levels.
Feel free to give me ideas on how to change or improve this concept!