Never heard of this "universal code" before, I suppose I should try it on my players. The settings for this are on the disc itself, so every one is different. Sometimes Stop works, sometimes FF, sometimes Skip, sometimes nothing will work. There are some players that will skip over the warnings, too. But I don't have a list or anything.

I generally try, in this order:
Menu
Skip
Stop
FF

If none work, I simply curse the studio and wait. These days I try to put the disc in early and give it time to get to the menu, so I don't have to wait once I sit down.