The benefits of chaff dumps as a summer feed resource are well established. Now there are an increasing number of growers not burning heaps prior to seeding. Weed growth in heaps is minimal and area covered is small (typically less than 2% of the crop area.
With ability to control dump height at harvest using the Smart Controller, Tecfarm Smartcarts allow seeding through with minimal or no preparation.
The Australian Herbicide Resistance Initiative (AHRI) WeedSmart Webinars are a valuable source of information when considering weed control options. Take a look at the one here dealing with grazing then seeding through unburnt heaps.