pushing the peadal with the battery dead won't do anyhting as the engine is drive by wire. no power means that it won't throttle. no trottle cable on thsi jap car.
as for jump starting, you'll need a nice diesel unit they're great at jumping cars. run it for about 10 mine connected with about 2500 revs on, should give you enough charge to start. you'll need a 2nd person to sit in the starting car while you turn the zed over. i tend to drop the clutch at the same time.
never tried this on the zed but it worked on my old mr2. couldn't jump it with my wifes 1.6 golf, but my 2.2 diesel would jump it every time, maybe get another zed owner round that would jump it.