Good idea. I've updated the test script to use ToolTip. I have the tip appear at its default position near the mouse cursor since that might be a little more usable. I didn't put an exit hotkey in since it might conflict with other scripts the user might be running.
http://www.autohotkey.com/docs/scripts/JoystickTest.htm
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the new beta works great for me... i've updated the script above.
If you get a chance and you haven't already, can you try out the 4 new control names I added above? On my joystick, the return values are a little weird for some things, such as button count.