Improving the /Z flag of Wave, NVAR, SVAR

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Note: I'm always coding with "NVAR SVAR WAVE checking" turned on and rtGlobals=3

1.) Currently the /Z of the above operations doesn't recognize dfrefs which are null and are supplied by /SDFR.
For example the following is my current way in referencing global vars in some of my procedures.
    if(!DataFolderExists(settingsFolder))
        print "BUG: settings folder does not exist"
        return 0
    endif
   
    NVAR/Z/SDFR=$settingsFolder scrapFormatOne, scrapFormatTwo, hddFormatOne, hddFormatTwo, exportLowRes, exportHighRes
   
    if(!NVAR_Exists(scrapFormatOne) || !NVAR_Exists(scrapFormatTwo) || !NVAR_Exists(hddFormatOne) || !NVAR_Exists(hddFormatTwo) || !NVAR_Exists(exportLowRes) || !NVAR_Exists(exportHighRes))
        print "BUG: some nvars are missing"
        return 0
    endif

I always have to check that the datafolder exists before I pass it to the /SDFR flag. In my eyes the /Z flag should also prevent run time errors due to invalid /null dfrefs in the /SDFR flag.
The following example shows hopefully what I mean:
#pragma rtGlobals=3     // Use modern global access method.
Function doTest()

    string folder="root:testing"
    string folderNonExistent="root:testingNonExistent"

    NewDataFolder/O $folder
    dfref folderDFR = $folder
    dfref folderNonExistentDFR = $folderNonExistent

    variable/G folderDFR:nvarOne
    variable/G folderDFR:nvarTwo
    variable/G folderDFR:nvarThree
    variable/G folderDFR:nvarFour
    variable/G folderDFR:nVarFive  

    NVAR/Z nvarOne = $(folder) +":nvarOne"

    if(NVar_Exists(nvarOne))
        print "nvarOne exists"
    endif

    NVAR/Z nvarTwo = $(folderNonExistent) +":nvarTwo"

    if(NVar_Exists(nvarTwo))
        print "nvarTwo exists"
    endif

    NVAR/Z/SDFR=folderDFR nVarThree

    if(NVar_Exists(nVarThree))
        print "nVarThree exists"
    endif

    NVAR/Z/SDFR=folderNonExistentDFR nVarFour // <- runtime error

    if(NVar_Exists(nVarFour))
        print "nVarFour exists"
    endif
   
    KilLDataFolder/Z $folder
   
    // now the dfref is still valid but the folder is non existent
    NVAR/Z/SDFR=folderDFR nVarFive  // no run time error, /Z works as expected

    if(NVar_Exists(nVarFive))
        print "nVarFive exists"
    endif
End



2.) It would be also terrific if there would be an easier way to get to know if the last NVAR/SVAR/Wave call with the /Z flag was completely successfull or not.
The idea would be along the lines of
         NVAR/Z/SDFR=$settingsFolder scrapFormatOne, scrapFormatTwo, hddFormatOne, hddFormatTwo, exportLowRes, exportHighRes
         if(!lastRefSuccess()) // or a V_flag
        print "BUG: some nvars are missing"
        return 0
    endif


Thanks for reading,
Thomas