Is it bad form to have a different number of audio tracks from video tracks? In Premier when adding a new Audio or Video track it wants to add both. In industry is it considered good form to leave empty tracks, say:


V2 Movie Clip 
V1 Title 
A1 BG Music 
A2 nothing


Or is it better form to delete those extra tracks or not add them to begin with so instead it looks like


V2 Movie Clip
V1 Title
A1 BG Music
I always avoid excess tracks.  You can add as many or few tracks of each types as you want in "Add Tracks..." Simply adjust the number of tracks to be added by clicking on the number.  It defaults to 1 video and 1 audio track, but that can easily be changed each time you add tracks.  

You can also add an individual track to either by right clicking in the header area and saying Add Track.

As far as industry standards go, I've never heard of a standard and I've never known anyone to think anything of having unused tracks, but cleanliness is always a plus.  There is certainly no standard to intentionally use excess tracks, but in my experience nobody is going to think anything if there are a few excess tracks either.  Generally cleaning up after yourself does look a little more professional though.