Several Publisher's Personas questions

[Stepaan]

Hi. After finishing my first serious project, few questions crossed my mind:

1. Imagine I have a linked JPG. Then I edit the picture in Publisher's Photo Persona and I need to swap the original jpg for the new *.afpub picture. Is there a way how to do this automatically? Or do I have save the picture first and then re-link the picture in Publisher Persona? (Yes. I don't want to bounce my edits back to the jpg. I'd lilke to keep all the changes.) Also, when I bounce the image back to jpg, Publisher crashes immediately.
2. Re-linking the picture means, I loose the placement of the original jpg. The newly linked image has a different size and a different position within the picture frame. Is there way how to preserve the original size and position?
3. How the publication grows, Publisher takes all of my RAM (16 GB) and starts swapping. Why, when I have all images linked, not embeded? Also, why is the afpub file so big? (In the comparison to the previous issues made in "you know what I made it in before" .)
4. When I use the isometric grid, is it possible to somehow simply revert the pictures back to the plannar wiew, when I change my mind?

Yes I know, it's a lot of questions, but the community here is so mighty  Thank you.

[loukash]

3 hours ago, Stepaan said:

Re-linking the picture means, I [lose] the placement of the original jpg. The newly linked image has a different size and a different position within the picture frame.

This is a known bug. It seems to be fixed in the current 1.9.2 beta version which should be officially released soon.