Previously I could play with up to 4 people on split screen but I can't add more controls, how do I do this?

Whenever i download workshop item or maps, it doesnt appear in the mod menu nor the actual map list ive tried everyting any help would be appreciated

I would like to play Black Ops III Zombies, but I heard there are a lot of security issues, so I stopped playing it for more than 1 year. Should I install some community patches? If I play this game again, it's gonna be only Normal and Custom Maps, solo or with friends....

Im planning to get into zombies and I wanna start with world at war (because its the first one in the zombie series) and then go over the black ops ones. thing is I heard/read that in black ops 3 there is the deluxe edition that gives you all zombie maps you ever need is that correct? or is there a benefit in playing each cod game's zombie mode? and yes i already have all the games (base games mostly, no dlc), just never tackled zombies yet...

someone knows if the T7 patch does count as cheats to can get a VAC Ban or its 100% safe to use it with steam :3