this seems like a major deficiency! if my project tasks is not shown on my group calendar what is the point of having a group calendar. seems that adding some simple code would fix this: if projects installed then show Deadlines on calendar can i add this myself?

An Automated Action (watch for tasks to be created) that runs a Server Action (create a matching group calendar appointment) may be a good way to do this. Check the demo database for the Automated Action "Set Auto Followers on leads which are urgent and come from USA." to get started on understanding how this might work.

seems like there could be a way to add a view that also shows the calendar data from the projects instead of making a new Record

I'm a bit late, but I agree with Jonathan, it's a major deficiency. Plus the tasks in project are only all-day tasks...