Hey cephalo, that sounds awesome.
By the way, we found a really bad flaw with the goodiehut->defended resource thing, so I think that's a bad way to go if it can be avoided. But I think you can actually place monsters and resources anyway, so maybe that workaround never made any sense to you. I was still stuck in post-map additions mindset.
I'm not sure how the "don't place objects" tag works, but if I'm correct it stops the game from placing more resources at the start of a game (random placement, that is). If that's the case, it would be cool to have some sort of hook with elementerra to spawn random resources such as the elementium world resource. Although I'm not sure how to make that easy for the user. Possibly just a tab with mods where the user can check if he uses the mod or not. Or another possibility is you just placing them anyway, then they will only appear if the user has the mod installed (memory leaks? who knows). Or a textfile where the user can enter a certain string. /shrug
Also, if someone wants to remove the various stones and stuff that spawn on mountainranges, they can replace their TerrainTypes.xml with the following: http://pastebin.com/raw.php?i=qMbp0BWr (elemental 1.11)
It's a core file modification, so the game will need to recompile the xml blob once upon startup. And obviously it will affect all maps. Hmm... maybe the "don't spawn objects" thing is making the game not spawn those random props either? If that's the case, obviously replacing the terraintypes.xml is pointless.
edit: props still spawned with the map "don't place objects" tag (with the standard terraintypes.xml).