It would be really great if the Proofing tool had more functionality built in that would allow for zooming, orientation changes, and panning - like other image or PDF tools. If this is something that creative or graphic teams would be using there is a notable difference in using Proofing vs. just putting comments in Adobe.
This is the #1 reason preventing my creative team from using Proofing vs. other toolds
Hi there, I like @Libby_Paulys Post and the idea of adding features to proofing 
Therefore I´d like to add a request for another function:
It would be great to have a kind of anchor to the Feedback in the PDF since it is a long way to scroll a huge document through to find the right section. (after clicking on the referring subtask)
Have a great day
I suggest you both split your requests, one thread per request, that will be easier for people to vote and for the Asana team to follow. 
(also there are existing requests for some of yours)
Thanks @Bastien_Siebman , I created a new product feedback
(Proofing // anchor to feedback in large PDF)