Having this option in C::B would of course be very nice.
You
do have this option for a long time in C::B. C::C can handle such projects just fine if they are setup correctly. The patch discussed here bring some more Fortran compiler support into C::B and tries to implement a Fortran specific project handling including CC for Fortran.
Meanwhile I had a look at the sources:
The changes in the core are the addition of several Fortran related compilers and some tiny bug-fixes (interesting btw...). The only incompatibility I see is the change of the abbreviations (which is hard-coded) to fulfill Fortran.
Concerning the plugin: I havened tried so far, I still need to compile this first to have a look.
But from my point of view: Bringing this Fortran compiler support into the core would be possible/feasible. What remains is the plugin. If it does not interfere with other plugins all should be fine. There is even SVN access to the sources. So actually if the author would like to keep this pluign in his own repo that would be just fine.