We have discussed having optional discussion groups, in addition to the regular S2L sessions. In our experience, despite the fact that up to half of the regular sessions are dedicated to discussions, it’s not enough time.
There are two basic ways to do discussion groups: either lots of central control and guidance, so everyone gets a similar discussion, or no central control, so that locals are doing their own thing. (One way or another, I will supply a list of discussion questions for each session.)
Which do you prefer? What will work for your site? Let me know what you think will work for you.