If there becomesis ever enough demand for it, simultaneous keypresses supported menykeypress support may become a standard stat avaiableavailable, but itthat is not likely.
I have heard that the SteelSeries Zboard h t t p://www.steelseries.com/us/products/keyboards/zboard/informationSteelSeries Zboard supports many (7 I think) kepresses. anotherAnother I have heard is Avant stellar h t t p ://www.cvtinc.com/products/keyboards/stellar.htmAvant stellar. Here is a link you many be intreasted in http://ask.metafilter.com/51940/Whats-a-brand-of-keyboard-that-allow-multiple-keys-to-be-pressedThis discussion might also interest you.