Nowhere have I said that I want to remove it, only that forwards-only could be an off-by-default option. Yes of course, many may want the analogy with back and forth tape head movement.
The current method does have some advantages. We can scrub back and forward without holding the mouse button down. But for me, audio playing backwards is a distraction (I will not be exporting backwards audio). It’s a delay to finding the part I want. I can remove the delay if I drag-seek with mouse down, but then I lose the benefit of not having to hold the mouse down and I still have to move the pointer again to resume playback.
If we had a “forwards play only” option then for example, moving the mouse backwards by five seconds if I want to hear a point five seconds previous would simply play forwards from there. Two separate operations are saved. I do not need to click. I do not need to move the mouse again after moving the mouse back.
I could as I proposed live without disabling backwards play if there was a way to click to resume play when it suspended at the pointer. If you simply want to play forward from the spot you found, is click not easier than Stop and restart standard playback, or drag the mouse off the end of the project?
As you said, I can’t change speed that way nor drag-seek, which is sometimes nice. Yes, I really like the speed change. 
If there was “forwards scrubbing only” then when I want to play from a previous point I would not need to click as would be needed for Timeline Quick-Play.
With scrubbing I am in the waves and can see more easily “what I am doing” without the distractions of Timeline numbers, an extra playback cursor and a vertical white line (I know I asked for that vertical line, but that was because we removed Quick Play in the waveform).
Yes, but I may not have found the place for the boundary yet. Until I do, I must constantly worry about keeping the mouse moving forwards instead of concentrating on listening.
If we had play-toggle, I don’t need to stop play, only click and don’t move the mouse.
Yes. I want to go back to a previous place and hear from there with less physical effort than now. I want an option to never stop when the playhead reaches the pointer, or to be able to click to resume play when that happens.
I have some reservations, as Peter does. Mine would be the physical Timeline elements distracting me from the waveform.
Also fumbled single-click can easily become double-click or vice-versa. We don’t have many options for modified Timeline clicks - we already use CTRL and SHIFT with drag in the Timeline for Cut Preview and Loop Play respectively.
Gale