1. Yes, don't think you even need to use something like vBA CMPS, though since we use it on our site I'm not totally positive without digging a bit. It's certainly doable though.
2. Yup. I think the instructions for that are in the readme that comes with 'Plog.
3. I've moved things from server to server with no major problems. All the images are stored in the file system (Photoplog/Images IIRC, though we renamed our photoplog directory "galleries"), as long as you update your config to point to the new forum directory location and copy all the files into the same relative locations you shouldn't have a problem.
4. See 3 above, backup your files and backup the database and you should be golden.
Hope that helps? We've been very happy customers, and it's just gotten better as we go
.
James and Susan