I think one of the "Crowns of Glory" for V1/V2 IS items all over the place!!! It is the definition of a dynamic, sandbox game: player's crap everywhere. I think it is awesome that one can walk around then.... BAM! you see a pile of gold or a dropped weapon or jewelry right in the middle of nowhere and you think, "This item has history. Someone was here and used it or died here." And I plan to make it even more interesting by having player corpses and remains to stay and spawn undead
And rummaging through a players ruined house is fun and lucrative!
So the main complaint is the world get "ugly" because of players. To me it is a beutiful piece of artwork created by players. I think players may just be used to a pretty, perfectly admin created and balanced world like WOW. My goal and want is the opposite because (I am lazy) and would rather give the players the tools to build the world like an RTS, sorta.
But let's take these one at a time:
1: Items left on the ground... stay on the ground. I think PLOT areas and quests was the only cleanup code I added.
a: boxes with wheels is good idea
b: display cases good idea
c: mannequins good idea
d: also, hanging items on the wall
2: garbage stays and should be thrown at your neighbors dog if they bark too much
3: paved roads will be VERY important in V4 since I am adding a Run mode that eats stamina. Roads/paths will allow stamina conservation.
4: dirt already goes poof. Cave ins delete items under them. Since dirt doesn't really have a use, I can see maybe when mining, you get nothing but that kinda seems weird. Granite is a resource and thus should stay. Dirt may become important though with elevation, we'll see.
5: ruins will get a makeover
6: maybe erosion with streams but probably not in general because you would need a mechanism to increase land height like volcanos, earthquakes and continental uplift then it becomes a tricky balancing act. I have tried long ago, heh.
7: V2 already does this
If you haven't noticed, plants and trees drop fruit (which turns into seeds) or seeds (plants without fruit). Then the seeds will grow into that plant/tree. It is running on slow right now cuz like Greatest said, it can run out of control but at any rate slow or fast, plants will take over the world given enough time since there are no animals out there that eat them to regulate the growth. In V4 I want to add plant/seed eating animals and thus speed up plant growth and see what happens.
But honestly, I do sometimes get bugged by the messy land players tend to have but it their land to do as they please.
If we can get a decent government system going then the leader/ruler can make rules and enforce them on players that cover being clean, neat and organized, etc.