For mine there was very little for me to tinker with, it was a single player Azerothcore repack ready to go, which is good because I am not very technologically skilled! There have been a couple bugs, like a couple of quests are kinda janked, but I can just go into the database and mark them off as done for my character when that happens cos I don't know how to properly fix them. Most of the tinkering was things like, do I want to adjust reputation/skill gains, how much stuff do I want the auctionhouse bot to list, how many profs do I want to allow per character, things like that. But that was all very easy to do thanks to the way the repack was done, and isn't actually necessary because you can just stick with the default settings. The only thing I can't do is PvP because I don't have playerbots, but I never did PvP on WoW anyway so it doesn't affect me much. I prefer it a lot to most of the multiplayer pservers I have tried, but I did tend to play WoW as a single player game mostly anyway! :D