Light me up!

So today I have acquired an Enttec DMX USB Pro interface. Apparently it controls DMX enabled lighting fixtures/dimmers from a computer. I'm quite excited about this idea. I've used these things before, and software such as Freestyler is quite good.
I would like to write a MacOSX moving light control application, but as of today, I'm not 100% sure on how to do it. I think I'll be able to work it out. I'd want to be able to do things initially like:

• Set scenes of lights
• Define bezier curves for moving lights
• Set limits on lights
• Be able to tell lights where a predefined X, Y and Z are and then work in a virtual 3d space for focusing lights
• Be able to soft patch lights (turn convenient Andrew numbers into real DMX channels
• Be able to control gobo, colour etc on movers
• Have some sort of command interface so I can type something like M2W1-5@F and have it understand that to mean Mac 250 Wash 1 through 5 at Full intensity

I know it sounds like a lot, but at the same time, it isn't really. It might be a project I play with for Summer Camp, and do some testing in free time at Camp. It could be a lot of fun, and really useful into the future. I'd like to make whatever I write open source, because there is a shortage of good mac applications out there. So what I'm waiting for now is for someone to donate me a DMX enabled Scanner so I can test my software :-)