At other game, there is a option setting that allowed player to disable guild/clan/gang/group invitation, so why not this can be enable at CC?

I know we can pretty much stop the gang invitation by blacklisted those fellas, but it is irritating/annoying to constantly reject group invitation by new player who just came in for a quick game and then never been heard again.

There is also some player that keep spam the friend invitation to everybody he see in lobby.

I would like this too.  Multiple times a day I will see someone run up to me, stop, and sure enough a few seconds later I get either a friend request, gang request, or group request.  Only once has someone bothered to ask me first.

+1

Another option would be to just ignore further invites from this particular player or gang - or having both :)