You can use conditional compilation to differentiate between live and dev as below (PRP is our live). So $$$debug(x) either shows the value in x on the screen in test or does nothing in live. Slight disadvantage is that what you test is not EXACTLY identical to what you run in live - but that's going to be the case anyway if you are "adding differences afterwards". 

 #if $NAMESPACE'="PRP"
 ; ############### test environment includes debug code
 #Define debug(%var) Write @(%var)
 #Define CSPdebug(%prog,%var) S MACROT2=$P($ZTIMESTAMP,",",2),^CSPLOG(%prog,+$H,MACROT2,"%var")=$D(%var)_"`"_$G(%var)
 #Define CSPdebugfull(%prog,%var) S MACROT2=$P($ZTIMESTAMP,",",2),^CSPLOG(%prog,+$H,MACROT2,"%var")=$D(%var)_"`"_$G(%var) I $D(%var)>1 S MACROT1="%var" F  S MACROT1=$Q(@MACROT1) Q:MACROT1=""  S ^CSPLOG(%prog,+$H,MACROT2,MACROT1)="`"_@MACROT1
 #Define CSPdump(%prog) S MACROT2=$P($ZTIMESTAMP,",",2),MACROT3="" F  S MACROT3=$O(@MACROT3) Q:MACROT3=""  S ^CSPLOG(%prog,+$H,MACROT2,MACROT3)=$D(@MACROT3)_"`"_$G(@MACROT3) I $D(@MACROT3)>1 S MACROT1=MACROT3 F  S MACROT1=$Q(@MACROT1) Q:MACROT1=""  S ^CSPLOG(%prog,+$H,MACROT2,MACROT1)="`"_@MACROT1
 ; ############### end test environment includes debug code
 #else
 ; ############### live environment no debug code
 #Define debug(%var)
 #Define CSPdebug(%prog,%var)
 #Define CSPdebugfull(%prog,%var)
 #Define CSPdump(%prog) 
 #endif

$Query may help, but more likely to be 

S FF = ""
For {
    S FF=$O(^Users(FF))
    Q:FF=""

    I '$D(^Users(FF,"SETTINGS","isAllowed"))#2    {

        W "No settings for user "_FF
    } elseif ^Users(FF,"SETTINGS","isAllowed") {

        W "User ",FF," is allowed",!
    } ELSE {
         W "User ",FF," is not allowed",!
}

(That assumes the 1/0 value determines whether the user is / is not allowed rather than the existence of the node)

One difficulty when converting old "dotted" code to use the new curly brackets is that New applies to the current dot level - same as if the dot level was a routine - but not the scope of the curly brackets containing the New.