Hi Dave,
Indeed I've added some tablet support in version 1.6.9. PI now receives and decodes tablet events when they happen on images, and simply translates them into mouse events. This is an extremely rough way to handle tablets but it's better than nothing; my intention is adding sophistication to tablet management in incoming versions (pressure, tilt, pen types, etc).
Tablet events are now received and handled by image views. You can use the tablet to move the cursor over the image. It seems that by implementing this, we have removed other functionality (directly provided by the OS) that you were using in previous versions. Do you think I should revert tablet handling to the previous state (i.e., not handling tablets at all)?