With 12.04 and a dual monitor setup, I can choose to have the unity launcher only on the left screen or on the left side of both screens. Ideally, I would like to have a launcher on the left side of my left screen and on the right side of my right screen. Is this possible in Ubuntu 12.04?
There is no supported mechanism for doing this; the launcher is designed to be on the left-hand side of the screen.
Hacks like those seen on this question might be developed (Unity is open source, after all), but I don't expect such a feature to be merged into mainline Unity.