Attached. This is usually pretty simple.
Flight Modes change the behavior of the aircraft - angle vs. rate mode, bank limits, stabilization, etc. - so are of necessity implemented on the flight controller. Your ini file needs to tell the flight controller to change modes, which on well-designed models (and the 200QX is that) just involves changing the value on a single channel.
Dual Rates change the response curve of the aircraft to the stick. They've historically been done in the transmitter, before we had computerized flight controllers. All of my aircraft do that as well, but I've seen some models that implemented it in the flight controller since it let them use cheaper parts in the transmitter. You also have to beware flight controllers that detect the maximum value of a channel for some purpose; using dual rates will probably screw that up.
For more info about this model file, my
tutorial on writing deviaiton models
explained everything in it in detail.
