Multiple Microphones for Voice control

I'm looking to use Homeseer in my home theater (HT) to send Harmony commands via voice. As you'd expect, the microphones that I've tried don't due too well b/c of the fact that the volume from the movie is one, also the commands can be coming from different points in the room/theater.
the HT dimensions are 15x25', and I was wondering if it's possible to put multiple microphones around the room, in various spot where people sit - so that it may better pick up the voice commands (since closer to the voice)?
any ideas/info?