Do you have "open" selected from the sync play pulldown above the picture on the canvas? It's the middle button between the percentage view and overlay selection.
That takes care of having the viewer play the multi in sync with your timeline.
To select angles while playing you need to use either the keyboard/button layout with "cut to angle X" buttons mapped to your keyboard. Under Tools/button bars there is a preset called Multi-Clip that loads buttons above your timeline.
Judging from other questions posted here about multi-clip editing and not knowing (or judging) anything about your experience with multi-clip cutting you might need to review the "View/Make Active tracks" options and how they affect your workflow.
andrew kines
ak
Sleeplings, AWAKE!