Is it possible with Gviz to render Sashimi plots for two alignment tracks with one of the plots vertically flipped? This would mean that the zero value was in between the two tracks and the arcs of each track would be pointing out to opposite directions, so the arcs would be joined at the mid-line between Sashimi tracks where the same junction is detected in both samples.

Also, if I render two Sashimi plots without any coverage plots present and set a cex.title value, the expansion doesn't apply to the numeric scale of the second plot (although it does to the track name). It works differently to when both coverage and Sashimi representations are both plotted. When both types are drawn, the layout of the track title is better because the track name doesn't overlap the numeric scale.