On Site Ethanol Processing - Use of crop waste

I would like to start a discussion regarding On-site ethanol processing.  I believe that 'decentralized' production of ethanol using waste from farm crops is a niche that has not been exploited.  The problem with the large ethanol plants trying to workout the cellulosic ethanol problem is the cost of the enzymes for pre-treatment of the waste products.  However, if a farmer can process the waste him/herself on his own farm using his waste or even his corn and then use the ethanol in his/her own equipment the cost would be drastically reduced and the use of ethanol would increase.