How do you compensate for Pan Law (6db loss) in FCPX?

Whenever I use mono audio in a stereo project the meter shows a 6db reduction in volume. For instance, if I apply a limiter to -6db (and add enough gain so it is actively being limited), my meter will show the audio peaking at only -12db. Yet if I analyze it with the MultiMeter, it will show the peak as -6db.

Supposedly this is the result of Final Cut's implementation of Pan Law. There's a helpful article - The Pan Law & FCPX - that explains the issue and offers several workarounds, such as changing the pan mode of mono channels to "dialogue" or simply adding gain to your final mix.

However I was curious to get other opinions on this. Is there a "best" way to handle this? And do I just have to accept when working with mono in a stereo project that effects (like a limiter) won't be accurately reflected in the audio meter?

Thanks in advance!