Issue Summary

Provide the capability to allow a subset of users to create plans and a (possibly) different subset to edit them.

In the context of a large enterprise environment, administrators may want to restrict who can create plans because:

• They may have a phased rollout and only want to grant users to the right to create plans once they are trained
• They would prefer to restrict this ability in general so that only team of teams and above leaders can create these plans
• They would like to control the number of plans being created

Currently the permission to be able to create plans is also tied to the permission to edit them, meaning there isn't a way to lock down the right to create plans and still allow users to be able to edit them and save changes to Jira. The "Advanced Roadmaps restricted user" role still allows the user to create plans but doesn't let them make changes back to Jira, so it doesn't fit this need.

In addition, being able to separate "delete" permissions from the general "edit" permissions is needed as well. It isn't ideal in most enterprise organisations for users who can edit portfolio plans to also be able to delete them (and anyone else's). 

Workaround

Currently there is no known workaround for this behavior apart from restricting membership of the AR "user" role to administrators who will manage the plan creation and AR "restricted user" role to trusted users with the understanding they won't create plans ( and possibly insert a hack to remove the option from the UI). 

There is no workaround for stopping users from being able to delete plans.