Being able to run a query, then click three times and then you have a chart, is a real boss pleaser (they really like coloured lines).
However, I'm not really fond of the theme and style so I always find myself fiddling with the advanced settings in the Chart Properties editor. When I run a lot of queries this becomes bothersome, so it would be really nice if dbvis remembered settings between queries
The properties I'de like it to keep between queries are primarily visual.
Pretty much all of the properties located under the Date View -> Chart Styles tab in the editor. That's what I'de like to see, personally, because those are the styles I tinker (or have been tinkering thus far).
Also, the properties available under the Layout tab in the primary dbvis window would be nice to have it remember.