WPML 1.3.0 will include functions that will allow controlling language properties without the admin interface. It’s useful for a lot of things, and in particular to migrate from other multilingual plugins.
I’d like to announce that WPML will include this import functionality, but it’s not the case. Instead, we’re looking for savvy developers would would work with us on such a project. What we’d like to see is another plugin that will do these migrations.
The plugin will convert the language information from the other plugin and add the language attributes to WPML’s language table. This will not be done using SQL hacks but via calls that we’ll add.
If you’d like to participate, visit the migration plugin forum topic. When this migration plugin is up and runnig, we’ll feature it on wpml.org and credit everyone who contributed.