Changing the format of the branch created from Opening a Task?

Currently, when opening a task, it offers to create a source control branch, which is great. Our team uses the task's ID from our task tracker - Pivotal, in our case - as our branch names.
However, there is a policy in place that the branch names need to match the id. Unfortunately, the branch that Open Task offers to create is defaulted to {project-id}-{issue-id}.
Since the project id is (most likely) a repository wide constant, its of little value to us.

My question is - is there a format string or configuration setting anywhere that I can set to change this default value to just be {issue-id}?