The "Cradles of Civilization Pack" has all the other mods included, so if you intend to use them all there's no need to also download the indivdual mods. The Pack is more for convience of not having to load 5 seperate mods every time you play.

The Pack also has a file within its first folder called "Civ Swtich.xml" which you can edit with Notepad or a similar program to set the individual civs included in the mod as playabe or unplayable for either the AI or human player. The extra city-states can be disabled by deleting the entire "City-States" folder in the same location as the "Civ Swtich.xml" file.

Also, can individual features be turned off within the overall mod ?

Got all the mods already. Is there an advantage to getting this compilation & replacing the original mods ?