Yes u can use it to roll down the back window. The unlocking of your door is weird. It should let you. It must be in a different mode. Try going online to see if there's a programming format
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The alarm I got came with auto start. And the module to lower the window in the rear. You can add the sunroof and other Windows if necessary. Now a days they can add anything And don't worry Best Buy is as good as anyone to install I thought the same until I had them install...
I honestly forgot which exact viper model I have. But trust me when you go to an aftermarket place or even buy one online they have different options on different models so just buy the one that has the specific options your looking for. Good luck in your search.
Use a test light. See if it's getting power when the glove box is open. Also , have you tried putting on your parking lights and seeing if the bulb works. It could be inline with that.