Use the Shortcut Editor, create a text shortcut like this:
- Enter " " (two spaces and no quote marks) into
the "Hot text" box
- Check the "No trigger" checkbox
- Enter ". " (a dot followed by a space - again, no
quote amrks) into the "Content" box
- Click the "Add" button.
With this new shortcut, Asutype will repalce double space
by a dot followed by a space.