I have not used the OpenACS project manager, but..
Should there be a plan before using project manager?
How well does project-manager handle projects that are not on a strict time-line or "floating" dependencies? Given that this redesign may not be well worked out ahead of time?
Do we want to expose the possibility of using a potential flagship package in an inappropriate way?
Would configuring the bug/ticket tracker to use project/tqm phase ticket types be more appropriate? For example: Observation, Problem report, Suggestion, To do. OpenACS almost has this configuration on the OpenACS.org bugtracker.