While it's looking unlikely a forum change will happen before the next Teensy model, at some point we do need to jump off the sinking vbulletin ship. The general advice I've heard it to avoid customizations and plugins as much as possible, for the data to properly export from vbulletin and import to xenforo. So we've tried to keep the customizations only to the most essential needs, mostly to combat the spam problem.
I know that doesn't help much, but at least there's a reason we're trying to avoid vbulletin changes....