Dave:
There are a couple of threads on the boards about this "problem". :sad Bottom line is that there is no supported way of doing this apart from logging onto the app as the project creator and manually adding another collaboration manager. Any automated solution would be a customisation that needs to go through CA-support etc. (I have a customisation that sets the project manager as an additional collaboration manager for example). the logic of "how" the customisation would work is in one of the thread on the boards (or a linkedin thread linked to by a post of these boards) - have a look around.
I've just discovered this fun little nugget myself (Clarity On Demand 13.2). So the way I understand, only someone named as a "Collaboration Manager" in Team Participants can create/manage discussions/threads/messages. And only the person who actually creates the project, OR any persons manually listed on the project template as a Collaboration Manager, can be a Collaboration Manager.
So basically, either I have to edit the template and put EVERY potential user who may wish to participate in discussions as a Collaboration Manager on the Template, or train all users who could create projects that they must manually add individuals as Collaboration Manager participants. Is this correct?
This is absolute absurdity and I cannot imagine why anyone would ever design a system this way!