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When you write your router make sure you’ve written the allow_syncdb() method. It takes both a database and a model. When you run manage.py syncdb you’re essentially setting the --database=default. If you don’t want your models to sync to the default database then your allow_syncdb() method should return False for the condition that db==default and model._meta.app_label==myapp.
You’ll need to run syncdb with the --database=your_other_db option to get myapp into that db. But make sure in that case that allow_syncdb() returns True only for the case that db==your_other_db and model._meta.app_label==myapp.
Does that make sense? Basically you have to run the manage.py syncdb method twice, once for each database. You cannot run it only once and have it update both databases.