Basically, Xbox stuff ripped and merged with the UI for whats compatible.
The reason SYSLINK isnt there, is because if you stay on the syslink server screen for more than 5 seconds, the game freezes, and if you try to start a syslink game, it doesn't even recognize the local machine is connected, making you unable to start a game.
Anyone who knows the memory address for controller index, please tell, so I can see what happens when you can legitimately start the game. The actual ingame code, has all the coop respawning functions still. I do not know about the actual splitscreen part however.
On this page of the site you can watch the video online [HCE] coop UI (Game missing multiple controller support. Currently useless) with a duration of hours minute second in good quality, which was uploaded by the user Kirby_422 13 July 2013, share the link with friends and acquaintances, this video has already been watched 812 times on youtube and it was liked by 23 viewers. Enjoy your viewing!