Subject says it all - we need the staff client to be responsive as well :)
I agree with you Nicole. And I think it would be nice to upgrade the bootstrap library used in Koha to version 3. The responsive capabilities of this version are much better.
This version is backwards incompatible, but the most incompatibilites ar in grid system, so it wouldn't be so hard to upgrade.
Migration notes are here: http://getbootstrap.com/migration/