"- In vBulletin, you were either enumerating over a user's posts or a user's created topics in one big list. And you'd have to apply "Advanced Search" filters to narrow it down."

Was this really such an issue? I can't really think of any way to separate IC posts from other posts without making stuff overly complicated for you. Perhaps have Spam/Members Longue/Off-Topic posts not count towards your post limit/post history?