hello I would like to know if it is possible i make Vanilla Server with 

Max. 3 players authorized on TC over the course of a wipe,Max. 3 players in a group. No swapping/replacing players ) ,Max. 3 players roaming/raiding together ?

As per Facepunch's policy, the only plugins allowed on vanilla are "Admin Tools". Any plugins that modify gameplay in any way are not allowed in vanilla.

so having watch Admin Tools ,

I conclude that it is not possible to do what I am looking for in a community?