Charlie, someone sent me a copy of a very old paper (was that you, Kathy?) written by a longtime breeder of the silver penciled rock - the article talked of choosing a cock bird with specific traits that would well with two different types of hen - when I say type, I mean coloring - one hen would product good males and the other good females - both using the same male. I am unsure what this is called, but the article specifically called out "look for a cock bird with XXX" type of thing. Fantastic article, very helpful, and it's what I'll use when I resolve some basic issues. I hope it works for me!
That would be what I (key word I) would call pen breeding. This can work quite well. It is probably the easier way of double mating. Depending on the color variety it can and does work. The color defect you are trying to correct is probably the real determining factor though.
It would also be what I was referring to above when I said you can get by for a few years single mating and then have to revert back to double mating. This is due to subtle color differences that are slowly becoming more prominent.
It would be well worth the time to see what the book The Mating and Breeding of Poultry link I posted above tells you. It will specifically give you ideas as to what color traits you should use for males and females. I have posted this link before. It makes for interesting reading.
Charlie