Oh yes, I remember that being implemented only in the iPod Video. It's one of the reasons I couldn't see myself using something too oldie, like the 4G.
I never got the preference of some users for the 4G though. It's way too thick for modern standards, not to mention that if it's about the sound, it has the same DAC than the 5G (Wolfson).
The 4th gen. has what I consider to be an absolutely beautiful design with nice touches like the centered headphone jack, rounded edges, and a larger clickwheel (the 5th gen.'s wheel always feels too cramped). I used the 20GB model, so it's almost exactly the thickness of a 60/80GB 5th/5.5 gen, which is a nice size for my hands. Modern standards be damned. The DAC may be by the same company, but they're different chips with pretty significant differences in sound to my ears. While the 5th gen. is not as bad as the newer models with Cirrus chips, the 4th gen. has a yet-still "duller" sound and a very restrained low end. I consider the 5th gen. to be a nice balance between the harshness of technical clarity and the older, in my opinion, more lifelike sound of the Wolfson line. But I ultimately ended up using the 4th gen. mostly for the external design and the handy black and white screen (which doesn't need a backlight outside of complete darkness). It's nice to have the option as far as sonic differences are concerned, though.
Btw, is there any specific reason why you decided to stand on that specific version of iTunes?
iTunes 11 was a minimum since I rely on Up Next every time I use the app, but it also carries my favorite iTunes UI with the wonderful expand-in-place album view. I steadfastly refuse to use Apple's ****** new designs which is why I'm on Mavericks, so no 12.x. I preferred 11.0.5 for its simplicity (and the iOS 6 device icons), but I also rely on the local-syncing for contacts and calendars, which was reintroduced in 11.3. 11.3.1 comes preinstalled with 10.9.5, and all my devices run iOS 6 or older (so no need for 11.4), so it seemed like a nice place to dig in.
Fun fact, I was able to customize the Retina Display .rsrc files to fix the lack of iOS 6 device icons and bring back the old app icon, but couldn't manage to edit the non-Retina one. Ironically, I use my MacBook in non-Retina mode to keep the smooth and consistent framerate, also QuickLook lags less. I know, I'm a monster, but I've actually come to enjoy the slightly fuzzy picture on the high resolution display. Fonts and shadows are thicker.