Can I change the default schema name in entity framework 4.3 code-first?

For those using Entity Framework 6, just use the HasDefaultSchema method:

public class Contexto : DbContext
{
    public DbSet<User> Users { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.HasDefaultSchema("MyDefaultDbSchema");
    }
}