Drum brakes are self-adjusting on RBV's. I had someone tell me that the adjuster would only work if you used the e-brake... After looking at how it's set up, I'm not sure that that is entirely true, but I suppose it's possible...
When I replace the adjuster (or when I do my brakes), I usually take the adjuster apart, clean it (they tend to get covered in crusty brake dust), then coat it good with either synthetic slide caliper lube or never-seize. If nothing else is available I'll use grease. I've found that seems to work well for keeping everything lubed up and moving the way it's supposed to. Or at least until my adjuster cable gets "eaten" by my Ranger... I've replaced the drivers side adjuster cable about 6 times since I've gotten the truck...
Backing off the adjuster (by pulling the rubber plug on the back side of the brake assembly on the bottom and playing around spinning the lil adjuster around) can help, but is not always needed. About the only time I've needed to use that method is if there was a big lip built up on the inside of the brake drum or something broke inside the drum.