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I just called my VIPER tech support to see if they have or had a way to do this, and ( NO ) so i then called a buddy ( tech ) here at ford and sad to say there PCM's are only programmed to do single stage unlocks..
Only way to have both doors is to add aftermarket keyless system or alarm combo.
I find this feature annoying as well. I'd switch to a single press to open both doors (like my previous stang) if I could. Having to double tap is just dumb.