Thinking of what I read these days about extending the memory of ATmega2560 and 1280, I'm thinking of adding one to Fork Arduino header and functions that activate and deactivate these features, and also suitable for use with DUINOS, I'm just waiting for the parts that I can test the memory usage SRAM extra.

The material referent is this:
http://www.scienceprog.com/adding-external-memory-to-atmega128/
http://www.scienceprog.com/freertos-on-avr-with-external-ram/
http://andybrown.me.uk/wk/2011/08/28/512kb-sram-expansion-for-the-arduino-mega-design/
http://majolsurf.net/projects/documents/100927%20Arduino%20Amani%20SRAM%20Expansion%20v1d0.pdf
http://ruggedcircuits.com/html/megaram.html