That's not totally right, is it? It will depend on what kind of instruments your aircraft is equipped with.
If you have an "old style" ILS instrument, you have to steer opposite of the Course Indicator, and what inbound course you set in the window doesn't matter.
However, if you have a HSI (Horizontal Situation Indicator - a yellow CDI with a moving middle section, placed on your gyro compass) you set the CDI to the opposite of your inbound course when flying a backbeam LLZ. That way you don't have to steer opposite of your indications.
I didn't think there were any full ILS'es around using back beam localizers, since the frequency of the GP is "slaved" to the LLZ frequency. You would get the GP information of the opposite runway when you use a back beam localizer, which is really not much helpful. Actually pilots are recommended to ask ATC to turn off the GP signal of the opposite runway when flying a back beam LLZ approach to avoid the confusing GP signals on the instrument.
If there are full "back beam ILS'es" around, there would have to be two separate GP antenna systems using the same frequency, which can be switched on and off depending on runway in use.
I've just never heared of that. Let me know if there are any.
Nick.