manjiri,
I don't know about harmatan,
but i think you should create your own virtual keyboard and load it to the "finger" configuration.
You can check the link below for references:

This is a link for a project of replacing the virtual keyboard with a handwriting recognition software. The source can be found there as well:
https://garage.maemo.org/frs/shownot...elease_id=3531

Hope it helped.

NBD