Hi gd_on,
You can add other languages for codestat in the option menu. However, Fortran comments are very particular (if I remember well, it can depend on the position of the first caracter on the line, can use different kind of caracters...).
Up to now, codestat can only be configured for "classical" comments (i.e. single line comments (for example, comments beginning by "//" in C++) or multi-line comments (for example, "/*" and "*/" comments in C)).
However, if you use Fortran 90 and only has comments beginning by "!", you can configure this "single line" fortran comment in the codestat options.