1. Yes, but it's not limiting the user. You need to limit everyone, and then selectively allow access back. Once you've that up, you need to enable the "reporter browse" permission. See https://confluence.atlassian.com/display/JIRA/Current+Reporter+Browse+Project+Permission - problem though - I don't know if that's possible with OnDemand.
2. No, you either have Greenhopper or you don't, there's no granular control over who can see it
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