I'm terrible with cross-compiling. It would be much simpler to just compile on the EV3, even if it would be much slower. As for what would be compiled, I was thinking CWiiD (linux wiimote interface), libusb (for various usb communications, which I've already cross-compiled), as well as other programs. This might not be strictly LeJOS related, but I'd like to see something like this in the next version of it. I'm terrible at java, but use LeJOS for it's extended wifi driver capabilities and ethernet-over-usb functionality. It would help a great deal if I could get other things to compile easily onto the EV3.