[Freeswitch-users] conference calling ideas

If any can share some ideas, I'm looking at making conference calls simple for the end-users of my FS system. Here are some issues I'm kicking around: 1. To create/join conferences - do you make a pre-defined list of extensions, each of which would join the caller to a particular conference room, or do you perhaps define one extension that will join the caller to a dynamically-named conference room (perhaps after making a choice in an IVR)? 2. How do you implement the idea of a conference leader - having a user who must call into a conference first before anybody else can join? Thanks for any ideas. - SW