The Lawson Mashup Designer is a great tool. New in 9.1.3 is the ability to use M3 MI / API calls in order to consume and edit data using any mi program. There is also a new MI tool that will allow you do genereate MI programs on the fly that will make your job easier.
Using the SDK and the ability to extend LSO makes it is easy to create your own mashup controls. Welcome to a world of possibilities!