If this has been mentioned before then aplogies for doubling up!
When youve got many paperspace tabs running horizontally across the screen it makes it more difficult to navigate the contents of all those printed designs. Therefore if the developers/imsi saw fit to add the paperspace features into a pallet instead, they could open up that functionality by giving us the ability to add notes for each printed paperspace,
The key aspects I think would be the name of the Paperspace, Paper Size, Designed for Printer Name and Basic notes.
The benefits here would be that we gain a little screen real estate back, and all other features or elements then appear in a pallet instead.