I've looked into it a bit, and it seems like I was mistaken about the amount of work involved. I might take a stab at implementing it sometime soon, if people are willing to do testing.
The thing with sound is that the emulator needs to be running at least 1x speed to generate enough sound samples, and the DSi is barely fast enough (most of the time).
Really?!
That honestly surprises me, but sure, I'll make a note to add more...
What version did you use?
I could have sworn I added trackpad mode in the Test4 build.
I'm glad you've taken the time to play with it though :)
Unfortunately, I have no way of utilizing slot-2 RAM at the moment because I do not have a DS/DS Lite...