section, meaning it is not even in your decided to-do list, not to mention any ETA :

"See the observed persons cursor, whenever it is moved across an image canvas, so they can point at specific features of an image or video."

But as I understand it, it is a feature that is just part of the "observation mode" that is already in place.
Is it ? or if not, what is the difference ? Won't you see all other people (members, guests and simple link-reviewers) cursors in observation mode ?

2) If I buy a deal with my personal email, will I be able at any time in the future to transition my account to another (professionnal) email, be it mine or one of a colleague ?

For the moment, my supervisor sees no interest in Picter, but personnally I do, so I ponder about buying a code personnally, demonstrating the interest of Picter through my own projects, and then if I convince him, convert my personal account to a pro account for my enterprise.

3) I just read most of your blog posts. I better understand the peculiar philosophy of the way Picter deals with (multipage) PDF collaboration, while still not being really convinced. But, having just finished today a 48-booklet project where I supervised the agency and was both providing the contents and reviewing layout work, I want to share these caveats :

With regular Adobe Acrobat commenting/reviewing, the only clumsy things are that you cannot have several people commenting simultaneously on the same version, and that (to my knowledge) you cannot freely draw or markup, you just pin a comment bubble where you want. But still, with the collapsible comments sidebar, you can easily parse and navigate through comments throughout the whole project.

So why not add in Picter the ability to natively comment/markup/review and so on within the native PDF, so that we may download a PDF with all comments by all users at the time of download ?

All the more that sometimes you may be working on PDFs natively with Acrobat, and not as an export format from InDesign or the like. So if you can get yourself a commented version of the PDF, you directly modify it from within Acrobat once you downloaded it from Picter.