investigated just FYI:
im in touch with @Spyhawk , he will take a look on that, it looks like strange, because in fact our cvar is g_inactivity "75" and its working like you will get a message that you are inactive, you will get the final notice that you 'was' moved to spectators but you will stay in the team for another 75 secs. So, its working but it take double time than it's set by cvar.