Oh yes...
You have lobes on the localiser too, you know! I remember once watching the system lock onto one of those and try to capture it. Didn't work very well; it just turned in, lost the signal and then went into basic "heading and altitude" mode pointed completely in the wrong direction. Our mistake was to have "approach" armed as we flew in "heading and altitude" mode, forgetting about possibly catching a localiser side-lobe. The "LOC" annunciation went from white to green and the airplane turned off the intercept heading while we (somewhat new to EFIS) did that "What is it doing now?" number.
When you are established high on the localiser then you might want to use "navigation" mode, when you track the localiser but do not leave the pre-set altitude, until you are close to the final approach fix at the correct altitude. You won't just have the machine trying to fly an impossible angle but it will not get you to the fix at the correct altitude.
If you have "approach" pre-selected then the machine won't know the difference between a false LOC or GS signal and the real one so that it will just lock on and try to fly it once that course guidance signal comes close to centre: one more example of how people are smarter than computers! Of course Situational Awareness comes into this; it is no good just sitting there expecting the machine to do all the work for you.