You can use a command line switch (kind of):
 Code:
If Not IsDeclared($BREAK) $BREAK="OFF" EndIf
"Switching BREAK "+$BREAK+@CRLF
$=Execute("BREAK "+$BREAK)

"Try and break me in the next 5 seconds!"
Sleep 5


Now call the script witth the option:
 Quote:
kix32 myscript.kix $BREAK=ON


If you don't want to specify the state you can simplify it:
 Code:
If IsDeclared($BREAK) BREAK ON EndIf

"Try and break me in the next 5 seconds!"
Sleep 5


Now just call the script with $BREAK to enable it:
 Quote:
kix32 myscript.kix $BREAK


If you want BREAK enabled by default unless you specifically disable it when the script goes into production, just change the logic slightly and include it in all your scripts:

 Code:
BREAK ON
If IsDeclared($NOBREAK) BREAK OFF EndIf

"Try and break me in the next 5 seconds!"
Sleep 5


When you run the script from the command line break is enabled, when you push it into production just make sure that $NOBREAK is specified on the command line.

Finally, how about deciding the break state based on group membership or login?
 Code:
BREAK OFF
If InGroup("DOMAIN\Give me a break")
   "Break enabled for support staff"+@CRLF
   BREAK ON
EndIf