Hello Stuart Hemming,
Thank you for writing.
We are still catching up with the documentation for the forward mapping functionality of the visual designer. We will have this functionality fully documented soon.
I tried many scenarios, but unfortunately I could not get any exception when changing a string property to be nullable.
Indeed, with the currently released version it is not possible to add associations between classes that are not mapped to tables. We are currently working on that, and are planning to release this functionality with the first SP release for Q2 2010.
About mapping new classes to a new table, we will be improving that to suggest default columns, etc. for the new table. Again, this will be available with the first SP release.
the Telerik team
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