i read T4M doubles the limit, but also i read about T4M will make or break your map so use it casually since many people stay away from downloading a map as soon as it has the words T4M in it. i would much rather prefer a simple map downloaded and enjoyed without any 3rd party program needed to be additionally downloaded by 4 people and pasted in and run with seperate .exe and its a whole mess i never got into since the time T4M was invented. still wont get into it so if you like MORE people to play your map, more people CAN without t4m, less people can with T4M since not everybody download all additional things required to run the map, and later on complain to you when it wont work without it even tho you clearly specify it needs it for even STARTING a god damn game on round 1 and that wont be possible among alot of players, especially if they play bo3 or bo4 coming soon, so to minimize the effort for everyone removing some sounds could be more worth looking in to than using mods, on top of the zombie map mod itself that will later on become your unplayable map
also running normal maps while having T4M on can cause massive graphical glitches and if you prefer closing and opening games for instance if you are streaming a cool new map, that will break the immersion, fun and whole player experience for the maps that follow the one you will make and get complaints about haha so think of the consequences