When I make a red ale, I use about 3 ounces of roasted barley, but don't mash it. Instead, I add it when I sparge, after the mash. It gives color without a lot of the roasted flavor.
Here's the last batch of red that I did
Red-Ale
I'm going to brew another batch this week, but am going to use a different recipe, with some Munich in it, but not a Munich-based recipe like this one.