How to make audio+video channel syncing (when doing splitting ) more user friendly?
is this the only way?


No, nor the friendly way.

Using the Control button to maintain the current position.


Place the line marker where you want to split the clips.
While holding the control button > click on the movie clip > select
Split Clip.
While still holding the control button down > click on the audio track > select Split Clip.


That's it.