I am finding your initial port of Sony Sketch v1.1 very useful on my Arc S. Thanks for the port.
I use it conjunction with Aeon's Xperia S Lockscreen and have Sketch as one of the four main lockscreen apps. Sketch auto-saves when you close out of a drawing, no save dialog appears. I use it when someone gives me a bit of info like a phone number or address.Hopefully you can get the palette to work, it sounds like other are looking forward to it. Currently v1.1 works really well for my needs - Again Thanks!