I believe that some sort of trading system like the GE should be added, i realize GE was not of this time but players in trading worlds that refuse to use auto-typers are clearly out matched and have a much more difficult time trading/buying items.
make regular vials easily accessible, so that they have a low price. But Water filled vials should remain as they are, meaning it is still a viable money making method
idk why you have not done this on eoc yet, but give all worlds an equal spawn rate, so that world 1 and 2 are not packed for all slayer and mining locations. And by equal spawn rates, I mean as good as a world with 2000 (max) players.
you should not be able to get random events in combat, since a lot of them are impossible to complete while in combat, such as giles and the mystery box.