If I'm thinking of the same exercise as you, then they probably wouldn't hurt to incoporate into your routine somewhere along the way. I'd also look into wrist-kiss pull-ups. Basically, take a normal, pronated grip, but instead of pulling straight up the middle, pull yourself on a sort of diagonal, so that at the top, you're chin is next to your wrist/hand. Alternate sides each rep. It's almost, sort of, kind of a 1-arm pull-up...but it isn't.
Remember, though, that muscle imbalances can be just as limiting as muscle weakness, so include an adequate amount of external rotation-type movements as well.