does the new trine 2 ldc got multplayer

Which is exactly what I said, if you care to scroll up a bit. It doesn't have a multiplayer button, though :)

Did you really have to resurrect a week-old thread for this ?

No. This only works after you have configured the controls at least once, because by default, controller for Player 2 and 3 are disabled. Once you have enabled controls for second or third player in the options menu (see the links I posted above), then you can do what you said. I just tested this on my notebook. If you don't believe me, try a fresh install of Trine 1 on a new machine and see for yourself.