When I generate a DataContext through sqlmetal, it converts all char fields to strings. Not what I'd expect it to do, but not a bad idea.
When I generate my entities through LinqPad, char fields are left as char, making my sqlmetal generated code incompatible with LinqPad.

Just as there are options on pluralizing and capitalisation, It would be useful to have a "convert char to string" option as well.