Using a blend mode with opacity control

Hi, I've just discovered a feature that has made me incredibly happy. I've found that transitions can be stretched over an entire clip and used with blend modes between two stacked clips. This option of blending layers has been something I've been looking for in an editor for a long time, and it turns out to be very simple and painless in Kdenlive, just drag and drop.

But ... I can't find any way to control either the track opacity, the clip opacity or the transition opacity once I have the two blended tracks. And if I use the Composite transition to control the opacity, it won't let me add another transition to control the blend mode.

Am I missing something right under my nose? Does anyone know of a way to be able to use both a blend mode and opacity control?

So far the only way I've found is by duplicating the video clip, but this is kind of a clunky workaround. I'm sure I'm missing something.

Video 1 > overlayimage.png
softlight transition
Video 2 > myvideo.avi
composite transition at 50%
Video 3 > myvideo.avi (copy)

Then shift > select all and ctrl-G to group so they all function as one clip.

Does anyone know a better way?