Which songs are talking about in particular? Last tour, in the current setting (one half step down) we got Something To Believe In, Let It Rock, Only Lonely, Blood Money, and pretty much every hit ballad in their catalogue that they ever performed live in their careers. When Jon's voice is in decent shape (which never is the case at the start of the tour), he can still pull the majority of the catalogue to a satisfactory level. The only songs that come to my mind that are absolutely out his current range (and half tuning wouldn't help much) are My Guitar Lies Bleeding and All About Loving You.

I disagree about tuning it more, because it is a thin line. Some songs really suffer from it, others not so much, but I just don't like when artists do that. Everyone knows Here I Go Again by Whitesnake. A long time ago I watched the live DVD from 2006 and it was downtuned half a step, Jovi style. It was OK, I can understand. But I watched live videos from 2011 and 2012 and it was downtuned even further, which I thought was unnaceptable. Once you start performing songs at a certain key it shouldn't be changed (unless we're talking about a completely different rendition). But I'd hate if Jon downtuned, for example, Always some more just to ease his job at singing it, when last tour we had some decent performances.