Why aren't Southern France and Southern Italy two war goals?
Probably for the same reason that around 30-40 other major disputed or ethnically different regions are not available as wargoals: they were never implemented. The wargoals system was only partially implemented in FtM, and still far from complete in TFH, so you can place a wargoal to conquer an entire country (regions A, B, and C), or ask for a specific region (Region B), but others were simply not implemented (A and C). This means, Germany can't claim JUST Alsace-Lorraine, without taking other pieces, and there are no wargoals for the southern part of France aside from the few border provinces (totally empty and useless in game terms) which Italy can take.
Playing Hungary, I can place a wargoal to conquer all of Czechoslovakia, I can use "Reclaim Cores" to recover the thin strip of game-recognized Cores along the border (the formerly Hungarian land which was historically returned by Germany via the First Vienna conference), or even claim the German-populated Sudetenland further north, but I can't claim either all of Slovakia or the rest of the southern region which was formerly owned by Hungary, and I can't get those without ending up with Ruthenia as well. Other than Bessarabia (a strip of land along the Soviet border), there are no individual wargoals in Romanian land, so I can't even take back cores there without annexing the entire country.
The game is far from complete, and really needed one more expansion before being dropped in favor of a completely new sequel.