Ack, Sorry, I misread the second part of the question (and status already appears in the issue view by default)
There's no way to display the sub-task status in the issue navigator because the issue navigator displays a list of issues.
There are some plugins which might help you show the list of sub-tasks (and hence their status), but I've not really seen a good way to do it, especially when an issue has more than a few sub-tasks.
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