Not strictly true. The handwriting recognition engine is closed, but the keyboard is open. A later post in the same thread suggests that writing a new input method shouldn't be that big a deal, but to my knowledge nobody has done it yet. It also confirms that new input methods become available to all the apps on the system, apps don't need to have explicit support for a new method.

Hi,

The VKB is not open in the current SW edition (IT-2005). You could go replace the current input method with yours (need root access).

Or, alternatively, lobby for the Input Method getting open in the next year's SW edition and do it properly there.) Maybe I should run a petition on this ;-)

Br,

--jakub