Favorite improvement: Additions of stuff you get for completing the game.
Thing which i still think "could" be adressed:
A difficulty modifier. i.e if you're new, and someones picked impossible, things are going to be pretty nasty. You could watch the replay of people successfully getting somewhere or you can think "well this sucks" and do something else.
I am unsure how possible it is, but adding commands -easiest, easier, harder, hardest which then creates a flying ward which increases/decreases defense by 10/30 (or whatever you balancing guys decide on) and possibly some small amount of regeneration (1% maybe) in your area only could be interesting. I would suspect you would need to -claim an area first then type it.
Would also give people here something new to attempt: Nightmare difficulty with -hardest on
But the main idea of it is to encourage new players. We're getting too many harder difficulty modes coming up because we have more and more players trying to do eternia, more players trying to defeat harder modes to get themselves ready to try against eternia, but very little games of encouraging new.