I'm always behind on the amount of compost available versus my needs. Whenever the leaves are perhaps 50-60% composted, I'll use them to fill most of the volume in a new raised bed, or will plow them in the top several inches of a new conventional bed. IMO the manure and partially composted leaves provide nutrients immediately, they help condition the soil for moisture retention (my soil is almost 100% sand) and to cool the soil, they serve as food for the earth worm population, and over the next season or two they continue to break down and provide a trickle of nutrients and other benefits to the bed. Whenever I get to a stopping point with establishing new beds, will probably let more of the leaves fully compost before using that organic gold. But for now, partially composted manure, leaf mold, with some completed compost appear to be getting the job done. Everything seems to grow quite well in that concoction of ingredients.