There's a lot of things you can experiment with, but some things just frustrate me enough I do wish I could see the code.
This doesn't count my two most recent pet hates, AP edges and Quests that obviously don't have the proper clues in place on how to begin/complete them, and don't follow any kind of real logic. (these are all older quests, but that makes it worse because 'only ancient vets' know the answers then)
So here's the three things I want to see...
1. What Valguarnera's tatt does. Getting it does seem an impossibility at present :P
2. Where those damn copper dragon sleeves come from. (I don't count this amongst my pet hates, because I'm just clueless)
3. How divination works. It's just too much effort experimenting carefully with all the scion stuff, and then, if it's weak, who cares right? Nothing you can do about it.
Yhorian