Just a quick note to let folks know that we received a request to support the Deadline field in our IntelliGantt Add In for MS Project 2010. So now it is! It is a date time field in project and can be mapped to a date time field in your task list that you can create. By default we suggest calling it 'Deadline', though you can map it to any date time SharePoint list column.
Also, not only Deadline, but all date time fields in MS Project will pay attention to the formatting options of your date time SharePoint list columns and change behavior based on the display options. If your SharePoint date time column shows date only, then the IntelliGantt Add In will compare year, month and day only when evaluating whether the field should be updated. If the SharePoint date time column shows date and time, then the IntelliGantt Add In will compare year, month, day, hour, minute and second when evaluating whether the field should be updated. In this way we make the sync cycle smarter so that only necessary updates happen. The end result is if you have turned on 'Notify when changed' within the SharePoint list, you won't be bombarded with useless update information.