Currently it is only possible to override enitity mappings.
To override a component you have to override the entire component wherever 
it is used.

It would be useful to be able to override the components to adjust 
conventions such as WithLengthOf for example.

I would like to be able to create a MyComponentOverride that inherits from 
something like IAutoMappingComponentOverride<MyComponent> to override the 
conventions for all components in the project.