Whatchu talkin' bout Willis?
I just tested playing songs that exist on my HDD as a single FLAC file w/CUE sheet. The files all split into individual tracks on my JRiver test library. I can choose song #3 and then half-way through double-click on song #7 and it immediately starts playing #7. I even took it a step further and went from playing song #2 on Album A and double-clicked on song #8 on Album B. Again...Flawless execution.
To be honest, THIS capability is the sole reason I decided to change audio playing software at home. MM could do it via a user's created script, but it wasn't pretty and seamless and I was sick of having a gazillion individual files, so I decided to walk away from a maintained library and start over with JRiver. I had already been using JRiver for all things Movie/TV Show, so I had the added benefit of only having to deal with 1 library on one piece of software instead of the way I had been doing things before.