In truth I'd be more concerned about your available dexterity in operating the video of the 5G nano if you said you had limited movement in your left hand. You can easily run the video app with your left hand alone once the app is launched. In fact, I think it's actually better to use one's left hand alone, because it makes it easier to hold without getting a finger (of either hand) in the way of and blocking the lens.
With your left hand, you can hold the nano as if your holding a pen...or a paper airplane...pinching the unit while placing your left thumb over the center button on the click wheel to turn the recording control on (and off). As long as the forefinger is kept relatively low (it's easy to do) there should be no problem with it interfering with the lens. Video quality isn't all that great, but it's serviceable. Just don't expect something that will look marvelous on a considerably bigger screen, because the results won't. But for casual remembrances, it's actually an adequate device.
For music the SQ of the nano is okay, but it's nothing to write home about. And with vid display it's pretty average; there's only so much a small screen like that can do.
I'm going on a trip to Florida in February and decided that with the money I know I am getting during the holidays this year that I want to get an MP3 player and a video camera. I want one of the small beginner cameras for taking video that would be used on YouTube / Facebook / etc. and the MP3 player will be used for traveling and possibly for going on walks this spring and while in Florida later this winter.
Friends have suggested that I might want to get a new 5th generation iPod Nano since it has the ability to take video and it is a small, easy to carry mp3 player. However, I have limited use of my right hand (my fingers and wrist have limited motor skills) and from what I have heard the Nano's video camera, while technically easy to use, has the camera in a position that makes its actual function rather frustrating (fingers get in the way).
As for the MP3 player end of things, if I go with the Nano that will solve everything. But if I don't, I need to come up with another solution instead. I have considered getting an iPod touch instead of the Nano (and then getting a video camera) as this would open up the possability of using my MP3 player for more video stuff, as well as a bit of light gaming and checking out some of the interesting apps I have seen on Itunes. However, since I have a very good media setup in my home (my pc monitor is a 720p 37" HDTV) and aside from my florida trip I will likely not travel so much, this may be a bit of overkill. (Although it is tempting since I do not need a cell phone and the Touch looks like it could satisfy the gadget fix without being completely useless.) If I don't get the touch + video camera or go with the iPod Nano then I will need to come up with some other form of MP3 player to pair with a video camera instead.
Honestly, I am overwhelmed. So many choices. Getting it right is not difficult -- getting it right for me quite possibly is. Any advice, suggestions, etc. are most welcome. Thanks for reading.