I think its fine the way it is. Noobs will be noobs and leave floating leaves, but I don't think we need a plugin to fix this. If you don't like the way it looks then go chop down the trees yourself and make it look nice, then claim it so no noobs can leave a mess again.

I disagree. Diamonds aren't really that big of a deal, especially since the advent of mending means all your tools will last forever. You basically need less than one stack and you are set for life (unless you tend to die and lose your items to despawn regularly). So diamonds aren't really that valuable. However sea lanterns are pretty valuable, they are difficult to get for the average person. You either have to raid a monument (which if there are any on the server I doubt they haven't been raided) or build a farm for them, so they aren't easy to get. Diamonds you can just dig into the ground and the law of averages says you will eventually get diamonds. I think the price of 25 mtc for a diamond and 7 mtc for a sea lantern is pretty balanced. Besides if it wasn't, as you said yourself, the market would adjust itself to to fix. All that being said, I am pretty new to the server and might be missing something, but the economy seems to be fine to me.

I agree with Morona, death counting system and head hunting interfere. There should be one or the other. If you want to require killing a player to get their head there should be an alternate system to counting kills which also shows a player's awesomeness.