I don't know, but I can tell you that there are two possibilities:
Either there is no such switch, in which case there is nothing you can do about it,
or
there is such a switch, and may be, via trial and error, you can find it.
Could it be /NOSZB ? or /NOSafeZoneBrowser ? or /NOSAZOBR ? /NOSZ ? /NOSB ?
Mind you, I am just guessing. May be you get lucky.