Q1: Is a cast iron pan to heavy for it?
An 8" cast iron pan would work on this stove, but I'd hesitate to go much larger simply because it would be very unstable.
Q2:Is the burner and post (above the regulator) also made of titanium? The description says just the pot supports.
A: Only the burner and the ejector are made of titanium, pot support is made of S/S and the valve is made of aluminum and copper.
Q3:How well does the fire-maple titanium backpacking stove handle simmering? It would be nice to get a stove that can cook eggs without burning them.
A:It simmers really well, but do keep in mind, weather conditions can play a major role in any stoves ability to maintain temperature control.