Can't help with the first question…how that might be done without leaving the TL. Assume you mean the equivalent behavior of a replace from start (or end).
As for deleting an attached audio clip, the forward delete key will remove the selected video and replace with a gap – should not affect audio clip.
Tom, you always come through. Great tips. Thank you so much. I didn't realise it was so easy to change the connection point on an audio clip and the keyboard shortcut to find the selected clip is great.
Russ, thank you for the tip about using the forward delete key. I had been using shift delete, but that's even easier!
While I have your attention, one more thing. My audio skim button cannot be turned on. Any idea why that is?