[dloranz]

I'm not sure if this quite fits your needs, but I noticed that a task group can have either sequential or parallel dependence regardless of the setting for the project. For example ...

Project 1 - Parallel
Task 1.1
Task 1.2
Task Group 1.3 - Sequential
sub-task 1.3.a
sub-task 1.3.b
Task 1.4

Cheers. - Dan