That list is actually missing quite a few emulators (and really simulators I suppose) that are some of the most important milestones in gaming history.
Frankly, I don't know why these (the emulators I'm about to list) are so unknown and seldom referenced on here as they're all in decent working order and I'd hope someone with more know how than me figures out how to run the games straight from launchbox rather than their gui (mvem works fine through launchbox).
Odysim is a Magnavox Odyssey simulator that even includes a lot if not most of the tv screen films and accessories. The original Odyssey came out in 1972 and is literally the first home video gaming console and predates even Pong which is its direct progeny. You can find it here although you'll need another player to really use it.
http://odysim.blogspot.com/
Mvem is the only fully working Microvision emulator and works just fine through launchbox as is. Just like the original Odyssey, the Microvision is the first of its kind, in this case the very first handheld gaming console with multiple cartridges predating the Gameboy by 10 years (1979). While it's display was quite limited, they were far more complex than the early game and watch and other handheld or tabletop games of its era. Just download this file emulator-win.zip on the index as it has the emulator as well as all 12 of the original games plus two homebrews.
http://www.studio2.org.uk/studio2/mv/
DICE is a simulator of the "discrete logic games" from the 70s that predate the microchip and software, literally the entire game was run with hardware. Pong is the famous example and works great on DICE but they're ever so slowly adding more discrete logic games over the years.
http://adamulation.blogspot.com/
Those are the important/historical systems that are usually missing from people's collections and I wish had more support/instruction from launchbox.
But there are some others that are frequently missing from the usual list of NES, MAME, Genesis, PSX etc... playlists.
For example, Winarcadia is an emulator that not only emulates the Emerson Arcadia 2001 which was an Atari 2600/Intellivision competitor that failed here but spawned at least 30 clones worldwide including the first Bandai console that had the earliest Gundam, Doraemon, and Macross/Robotech games (which are surprisingly good considering their age). In addition to the Arcadia and its many clones including the Bandai console, it also emulates early computers like the Elektor TV Games Computer (1979), the PHUNSY computer (1980) and the Interton VC 4000 video game console and its many clones. You can find the emulator here
http://games.softpedia.com/get/Emu/WinArcadia.shtml
Another relatively obscure emulator I wish launchbox gave more support to is the VCC an emulator of the Tandy/Motorola TRS-80 Color Computer aksi known as the "CoCo" circa 1980. Not only am I partial to it, as its the home computer I personally grew up with as a little tot, BUT it has a couple of important milestones. Dungeons of Daggorath is basically the first real time, first person rpg in existence. There were some earlier attempts but they were for mainframe computers and while they looked similar had limited or no variety in monsters and equipment while DoD had a healthy selection of both AND the very first example of a "health meter" utilized through a really cool and innovative at the time heartbeat measure. Downland is another innovator, the first real multistage platform game long before SuperMario was out. DinoWars was the first "fighting" game to utilize 3 dimensions and there are lots of other neat original games like Poltergeist, Stellar Lifeline, Temple of Rom, Doubleback, and Canyon Climber plus lots of ripooff clones of more famous games like Polaris (Missile Command), Slay the Nereis (Millipede), Microbes (Asteroids), Popcorn (Kaboom), Clowns and Balloons (Clowns), Shooting Gallery (Carnival) and more. You can find the VCC emulator here.
https://sourceforge.net/projects/vcce/
Another old computer emulator inexplicably not shown enough love here or anywhere else really is the Classic99 emulator which emulates the Texas Instruments TI-99/4A circa 1981. It was in practically every school in the early and mid 80s due to contracts between Texas Instruments and the government just like the Apple 2s. Unlike the Coco, I can't say any of the games are really groundbreaking but I can say that Hunt the Wumpus is one of my all time favorite puzzle games and each game only takes a couple of minutes so it's a great short time killer. And Parsec is a pretty nice older nut fast paced sidescrolling shooter. You can find the Classic 99 here.
http://www.harmlesslion.com/cgi-bin/showprog.cgi?search=Classic99
Finally, another obscure emulator that may be closer to your younger heart is PokeMini which is an emulator of Nintendo's biggest bomb...no not the less obscure Virtual Boy, but the tiny almost microscopic handheld console, the Pokemon Mini. Most games were not released in the US or in English but the diehard fans have translated most of the games so you can easily find English patched roms of all of the games. It's quite a neat little handheld and after seeing it, my wife made me by her a real tiny little green console with all of the games plus a cart to import the English patched games onto it. You probably don't have to go THAT far...but Pokemon Race is a nice little endless runner that is the long ago predecessor to the Super Mario Run App just advertised at the Apple showcase today. You can find the PokeMini here.
http://www.pokemon-mini.net/emulators/
Now as far as Launchbox integration, PokeMini, Winarcadia and MVEM work just find by launching the roms with the emulator. But I haven't discovered how to run Classic99, VCC, Odysim or DICE directly through launchbox TO the games. Without the proper command lines it just takes you to the GUIs. Hopefully someone here can help me out.