Theoretically, nothing is impossible in an LD. It's a only matter of practice and willpower.

One thing i tried during my last LDs is is talking through another DC, like being deep in my head and having my inner thoughts expressed through another person, at the same time.

The last time i tried, some DC spoke complete gibberish, eying me very seriously. It was somewhat funny and weird. I'll just keep trying until i get it.