Earlier quoted context omitted.
> However, I've found that this feature has been worsened a bit since v6 How exactly?
In Ardour 5 I am able to simply slide the playback speed slider ("shuttle speed control") to start playing at >1x speed, and after releasing the mouse button it keeps on playing at that speed. In v6+ the sliding part still works, but upon releasing it the slider springs immediately back to 1x, so I can't easily select a playback speed and keep it going. As a workaround there's the varispeed option, but for me it's no…
Then you can upgrade to 8.1 and get the benefit of interview mode ripple editing.