I wrote a batch script that MCEBuddy runs when it starts processing each file. If the main computer is above the threshold you set, it starts looking for other instances of MCEbuddy you’ve entered as back-ups. If it finds one idle, it moves the file to where the back-up computer can find it and process it. If it doesn’t find a back-up computer, it keeps plugging away like usual.
You have to set up each instance of mcebuddy to access and monitor the right locations, and process the files the way you want. That part isn’t automated, but once you input that information for each computer, it should just run. Here’s where I posted the script and more info about it. Let me know if you have any questions.