Sometimes I joke about the limited features on my sewing machine - but it has one feature that I absolutely love - I can remove part of the bed, which leaves only a narrow extension that fits inside of cuffs, etc. for all but small children's clothes. (I am pretty sure that this is referred to as a "free arm", but I could be wrong on that...)
I love this and use it all the time - probably even when I don't really need it, such as in the photo above. ;)
I wouldn't buy a sewing machine without this feature and it constantly drives me crazy that my serger doesn't do it.
So, how about you? Does your machine have this feature? Is it important to you? If you don't use it, do you have any tips for sewing in columns such as pant hems and sleeve cuffs?