Hi Jurgis,
our group in Florence has been using Synergeia for a couple of years and we drew inspiration from it for our project aimed to add typical CSCL features to Moodle.
You can here find details and the first chunk of code (as an add-on module named "Forum Plus"):
http://moodle.org/mod/forum/discuss.php?d=26081#140855 and
http://moodle.org/mod/forum/discuss.php?d=26081
So, we will be glad to receive any feedback on our work