A third party radio remote - some of them - will allow multiple shots. Unfortunately I don't know which ones do and don't on a D5100. I am pretty sure that the Hahnel that I have does NOT, but I think that the Yongnuo ones that I don't have will do multiple shots. (I have the Yongnuo 603, and it does do multiple shots on my D2x/D3. This is the same RF tranceiver pair used for a D5100, but with a different cable - so I think it would work, but don't know as I don't have any of those class of camera.) The RF remotes are pretty cool, because they generally make for a cleaner experience. Now I can plug in the RF receiver module and actually leave the transmitter in my pocket and trigger it from there! No leaving it somewhere, no needing to having the IR transmitter dangling around my neck, no worrying about line of sight, or distance. (Both the Hahnel and Yongnuo work from at least 150 feet, which is the diagonal distance across an equestrian ring.)
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!