My desktop PDF viewer ([Okular](http://okular.kde.org/)) automatically remembers this preference on change (hand tool / selection / zoom mode). Adobe PDF Viewer also saves the hand tool setting. Because I'm used to the first one, and the second one is widely used by others, I believe that users expect the preference to persist in PDF.js as well.

This discussion is getting quite long, should I create a new issue so that others can join the conversation as well?