While SPARK-111 is really cool. I’'ve found out that actually i can select some users in one group with Ctrl or Shift and while holding Ctrl select first user in other group then press Shift (so Ctrl and Shift are pressed at a time) and select last one. So both selections will stay. Or just hold Ctrl, and then select some user in one group, then Ctrl-A, select one user in other group again Ctrl-A.
But, i still would like to be able to select just group names instead. Now, left click is expanding or collapsing the group. So maybe selecting should only work while Ctrl is pressed? If that could be achieved.
And then right clicking such selection should give Start Conference and Send a broadcast options.