Provos as this is for 3.5/d20 is there any reason your seeing so far that we could not include this in the d20 project? We already have allot of Dragonlance and some Eberron. Don't see why we could not include Dark Sun also. Would increase the ease of people getting your stuff.
We can easily add a new Parent source for Dark Sun in the next release so all your stuff can get source marked below it.
Also don't forget to check out the d20 project as it has hundreads of the 3.5 splat books in it and at this time about 2-3 times as much feats and things as HL Core. So if nothing else it is good to get so you can take a look at how scripts function. No reason to reinvent the wheel.
Let me know....