Project: Blender Extensions
Tracker: Py Scripts Upload
Category: 3D View
Script name: Viewport Roll
Author(s): Jace Priester
The viewport currently has pan and tilt but no roll ability. This script adds roll capability and uses the only remaining middle mouse + key combos to do so.
Alt + Middle Mouse allows you to use the mouse to roll.
Ctrl+Shift+Mouse wheel scroll allows you to roll via scrolling.