Adding additional hook.

I am writing a plugin that will make the charts accessible for people with different kinds of color blindness.

I need to draw patterns on-top of the series and the current hooks provided like "drawSeries" executes before the objects are drawn. This causes my patterns to be drawn behind a bar for example. This is why I need a hook for after draw. This way I can draw on-top of the chart.

I see various hooks that I would like to add but I don't know what is your policy on this?
In example: onBarDrawn with a signature that would contain all the coordinates of the bar.