Don't know much about these, but I would have guessed that if the touch screen presents itself as a HID device, it would just work out of the box - but you should use UI1 as this is designed for touch interface. If not, then you should look for a driver for it that is compatible with the 2.6.22-14 Linux kernel. If you can get that, then it will be relatively simple to add it to your MD. You can just ssh into the MD once it is running, then install the driver normally, and that will install it into the MD's image. You could even make a device template so that it plugnplay detects it and installs the image, for others that come along...