Hi Caroline,
1) In General, since US joined HRC, the perminent office of US in Geneva hold briefings, raise more questions at UPR process. In the case with Burma, Nepal, Singapore and other Asian countries, they are quite open to Stakeholders' contribution for the UPR process. In deed for Burma, Ambassador Eileen Dohela was one of the three Troikas members. I am not sure how involved they are in terms of funding and specical procedures. I can give you some contacts if need be.
2) No enforcement as far as I know except pressure
3) HRC has come up with the themastic study on Cooperate Social Responsibility, which I think we had during Ajern Sriphrapha's class. Others can contribute more and I will try to look for the HRC resolutions on this from my folders...
Cheers,
Cheery
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" The only constant is change"