This is a meta issue to list all the possible tasks or features on how to improve the pathauto interface for future versions and help get the module in a state ready for Drupal 7.
Path auto issues:
#273104: Using "progressive disclosure" for alias patterns
#322378: Revise and cleanup Pathauto menu structure
#328616: Improve the punctuation settings UI
#509754: Use vertical tabs to improve the interface
#201151: Use batch API to perform path alias bulk updates
#713632: Split settings UI into 'Patterns' and 'Settings' pages
Core issues:
#147143: Add new URL aliases UI
Other:
http://drupal.org/project/showaliases - #645894: Combine with Pathauto