I was only hoping for bar in addition to line because I find sometimes the Sparkline is more informative with bar.
However, when I found that jQuery Sparklines has bullet charts and box plots I got greedy.
You can change the format of sparklines in tables. There is an example in Splunk 6.x dashboard examples called Table Element with Sparklines in which the default line version of Sparklines has been changed to bar.
Thanks for the reference to the dashboard examples app. I was looking for a GUI option to change sparklines similar to how one changes charts.
Back your original question. It appears that the option settings apply to the SingleValue rather than the sparkline so something like
If you look at jQuery Sparklines and in tables for Splunk, you can have lines, bars, and other formats for sparklines.
I tried changing the single value visualization from line to bar the same way you change from line to bar in a table, but it didn't work.
I have no experience with jQuery Sparklines, but all of the sparklines I've put into tables only have one format.