Bar Chart Line Symbol Sizing

Hi,

I am using the bar chart, and inserting a symbol for a line as a target.  Ideally I would like the line to be wider than the bar, but when I increase the size it increases the area - making it hard to see if target has been reached.  

Ideal solution would be to edit the width and height of the symbol separately.  See attached - the thickness of the line is preventing us from knowing if we are just over, or under budget.  The Qlik Bullet chart line is a great example of the correct sizing, but obviously missing the features of a vizlib object.

Could we get this in the next release?

Thanks
Paul