Philip - you can't get added to the Trusted List of the Project page, because there is nowhere to request this.
On the freespace page, it says:
Please don't add posts here; they will be deleted. If you want to add sources of information, please add to the comment boxes on the profiles. This way everybody concerned will be kept updated.
There is a place for requesting to be added to the Trusted List merely because that is the way the software is configured; there is a similar place on other profiles. It is a technical issue that it can't be shown for some and not for others. If ordinary Wikitreers request to join the TL, nothing will happen. It tells you on the freespace page who to contact or G2G.