Yes my fix is for PhotoPost Pro. vbGallery is way much more complex as far as things go meaning we would have to actually release a brand new code branch to support 4.2 which will definately take time. You can do the same suggestion I made above disabling any vbgallery navtab and create your own in vb nav manager.
As far as Activity Stream Alfa1 it is something I will probally look at like I have said a few times now. There is actually no documentation on the activity stream and how to add stuff to it yet. Most likely no docs on that will be available on the vbulletin.org site until such time as it goes gold and some time after.
Remember the activity stream is a brand new feature. I merely posted the above thing for Pro because it was an easy fix.