@me man That's pretty cool. I didn't realize they left that one in there. They do leave a lot of older stuff in though. Even the Tag Elimination Chamber is in there as match type 40 if I remember right but needs some extra help from Cheat Engine to get it sorted and playable.
Regarding handicaps, I also found where the team assignment values are, so for example it's possible to take a 4 on 4 tag match and convert it into any handicap situation you want by forcing Tornado rules on and assigning teams as you see fit. So for example a 1 vs 7, or a 2 vs 6, or even a 3 vs 3 vs 2. Lots of possibilities are there. Handicap War Games may also be possible.
If you happen to stumble onto a way to get 8 people into an Elimination Chamber, please let me know! I'm currently trying to solve that so I can create an 8 man Chamber where 4 people start the match and the other 4 are in the chambers. Once I have that I'll also be able to do 4 on 4 Tag Chamber. I already know how to manually assign the entry values to force 4 people to start the match but am having trouble getting the timer to work right to release the others when it's an 8 man, so I need a way to inject an extra 2 people into the 6 man selection screen similarly to how Wrestle+ used to be able to do that a few years back in the older games.