I've started .. dabbling a bit with the .ini files. Creates a couple utilities to easily manipulate them, adding and removing properties through an interface rather than just editing a text file. Probably won't go anywhere as I usually end up abandoning projects after a couple weeks. I stripped down the .ini's and wanted to see what limits could be pushed, but a couple things confused me. I have found some help in your server files, Roarion, but it seemed to only touch on a few subjects.
skill.ini:
It seems to me that some of the skills are hardcoded. Run, Melee/Missile/Magic Defense, Mana conversion, Stealth, Swim, Scan, Deception, Assess, Tame and Climb .. for each of these, I can modify the skillpoints needed, the attributes it is affected by, whether players can train it and its description. But it seems I cannot actually change what they do. The effect of how much magic defense actually defends per level doesn't seem configurable. Neither does run speed, or .. any of these. I can make items require these skills in order to use them, but that's about it. Right?
item.ini
Subtype: I have seen Class used in a couple instances, but I can't seem to find an example of where Subtype is used. Is it just used to help describe the type of item or is that value actually looked at anywhere?
AllowSurfaceGrowth: This doesn't seem to have anything to do with growing at all. From what I can see, this property simply allows the item to be (placed as the result of "SuccessFocus" in itemuse?) on a slope, used pretty much for fences. Is that true?
Group: I see many groups defined in the beginning of the item.ini. Are they used for anything?
MoveDirection: I only see this being used for "Sulfuric Gas". Does this cause the item to move by itself? What does the value represent?
Build/BuildWarp/Dungeon/DungeonWarp: These 4 all seem to contain a series of values. I'm guessing for build and dungeon, it's an ID followed by a set of coordinates and for the warps, its an ID followed by two sets of coordinates. No idea what they mean though.
I have more questions, but I'm not even sure these will be answered, so I'll end it here for now.