Usually you just need to set VTA present. And if you have a factory remote start set hood latch present as well. I have been able to enable it on a few trucks using the alfa tool a few months ago with no issues. All the trucks had remote start. I just tried to enable it on a 2015 1500 without remote start and it didn't work. Im pretty sure others have been able to enable the VTA without remote start but not sure. The code set pretty quickly on the other trucks I did.
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I was able to activate it on my '14 1500 which does not have remote start.
These are my settings: (The highlighted bits were my observations from reviewing BCM files, not part of the settings)
Control-VTA Indicator Request: Yes
VTA Warning LED Output Present: Set
VTA System Present: VTA
Automatic VTA Arming: Not set
(2014 only)
Vehicle Theft Alarm Present: Not set
(2014 & 2015 only)
Sense-Hood Ajar Switch: No
Hood Ajar Switch Input Present: Not set
-K