DoDonPachi Dai-Ou-Jou, Oriental Legend Super and The Killing Blade are working in FBA 0.2.97.29. Be sure to have the correct and most current ROMset for it (by generating the dat with FBA and scanning your arcade ROMset with Clrmamepro).
Concerning PGM2 emulation, i don't think it is for now. For The Gladiator - Road Of The sword, it is almost fully playable in lastest MAME SVN 26158...So i guess it will be the same for FBA.
Finally for Spectral VS Generation, only future could say if it will be emulated a day.
Actually the major problem with PGM emulation is to dump the internal ARM7 Rom which is read protected...without a good way to bypass the read protection and to obtain a full and correct dump of the internal ARM7 Rom, some of those games only runs with many tricks and hacks (which is finally good for the player but not really satisfying for the developer who first purpose is to want an accurate emulation)