I strongly agree with Mr G: the capability for players to move to "allowed pages for them" would be really great. I'm used to such feature (in other VTTs) and it's very useful, so I'd like to see it also in Roll20.
In this way, players could navigate to Roll20 pages displaying, for instance, their inventory or character sheet arranged in a graphical mode, or to pages related to the background of the campaign. The point is that some Roll20 pages can be set as "reference" for the players checking them without the GM dragging them there.
This would help, also, for games in which the GM isn't present ATM, allowing players to browse background info or other references inside the Roll20 app (locations, Roll20 page as character sheet, etc).
I was going to open a suggestion exactly for this; if the devs/mods receive it well, I will not open a new thread just for making it clearer.