Hi Dave (Inertia),
Yes you are correct, in fact in my Alien project 'AFOR' which you have seen, all of the switched functions, i.e. the Aliens plasma gun (water pump), turning on the jet thrusters, etc, etc, are all triggered from the DX10 by taking AUX channels from the receiver to various Action switch modules.
For anyone reading this who is not familiar with this methodology the only consideration you need to make is to check how much current the device you are activating uses. For turning on something like an LED or two then a low current solid state (electronic) switch is fine, however if you are turning on a pump or oil burning smoke generator then you will need to use a relay based switch or a solid state switch that can handle higher currents (typically up to 10 amps).
An important tip in all this that everyone should note is that in all my models that use lots of switched functions is that they are powered by a separate battery (or batteries). Don't use the receiver battery as switching on high current devices can dip the battery voltage and in some cases cause the receiver to experience what is known as a 'brown out' and cause the receiver to loose its binding to the transmitter (2.4ghz operation).
If in any doubt don't hesitate to ask questions on the Forum as there are many people on here who like me come from an electronics background.
Steve.