It just does. And not just CreateUnit. Every time a unit is created, a rather large chunk of memory is eaten up. Forever. Well, until WC3 is closed, but that's forever enough. Closing WC3 is the only way to free that memory.
Why not ask Phyrex1an to help you import? He's going to be MIA but I think he can write a tool to extract the custom actions, like he extracted all of the GUI actions.
I don't think I'm dealing with quite the same pressures though, at the very least its a significantly smaller system. For the time being I'm just going to put together a quick scrubby box though and hope it works good enough to not make my house toxic
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.