A: > within permissions/roles is it possible to allow a guest/user to create tasks and only view/edit tasks they have created or been assigned to?
No, we do not have private tasks and do not plan to add them. Since we have plenty of ways to see tasks across projects we advise to create a new separate/secret project if you need to.

> I work with other freelancers and want to be able to allocate them a task that we can corroborate on without them having visibility across the entire project.

We are not the best tool for this unless you make a project for each freelancer.