Hello Steven,
Unfortunately Quickbooks does not allow 3rd party apps to access that field. As a matter of fact, the whole Employee table is READ-ONLY in Method. This is a limitation of the QuickbBook's SDK. If you need to update an employee's information, you will have to do it through Quickbooks.
-Kalvin
Kalvin Ng
Customization Solutions Specialist
Method Integration Inc.
Local and overseas: 416.847.0400 ext. 748
Toll Free: 1.888.925.6238 ext. 748
Fax: 416.640.6027
Website: http://www.methodintegration.com