Hmm...no other responses...May be it's not a good idea to keep posting further questions in this thread.
Well, I will give it another try anyway.
I'm trying to use onProcessTrigger() to handle launching of things via a plugin, but for some items it didn't create  -- is it correct that this is currently a futile endeavor? The following FScript source snippet gives me the sense that that might be the case:
PREFUNCDEF BOOL EFuncName_Allow_ProcessTrigger(const char* destbuf_path, const char* destbuf_caption, const char* destbuf_groupname, int pluginid,int thispluginid, int score, E_EntryTypeT entrytype, void* tagvoidp, BOOL *closeafterp)
// does this plugin want to take over launching of this result?
// if we didnt create it, let default handler do it
I don't think I have an environment to make this change myself -- any chances of takers or perhaps producing a version of FScript that will compile under Code::Blocks?
 I'm investigating the idea of implementing FARR-specific file associations.