Ok dear people,
this is an issue which occured together with the apparition of the for me absurd, useless, place consuming... smart tool
In older time, I used to say: "the best point from avid against all the other edit software is the asymmetric trimming!", trimming different sides on different tracks.
It was at the time where rollers used to be always pink and not smetimes pink or yellow. You could from track to track adjust the side which needed to be trimmed and especially for dialogs! a routine done 200 times per day.
Sadly enough, this is not the case anymore and this cost me daily a lot of time and 
...
You have to click really many times to get what you want, get the most absurd settings and maybe at the end you have to go out of trim and again in, because it is so messy, you just lost your concept!
---> A case where the bad programming influence the quality of my work, and that is why this is for me my absolute top priority issue with Avid.
The logic should be:
- You choose one-side trimming. When you then shift-click a roller, this one should go on the other side and just NOT give the option to become both-sided for that track, because it is ridiculous. It would spare one click per track!
---> If you want then to swicth back to both-side trimming, press the cycle trim or the center trim key (ü on a german KB)
- You choose both-sided trimming. In this case, shift-click a roller would change all rollers on that side.
- For the playhead, the standard should be always the V position, because it is 90% where we need it to be, and if you want it on an audio track, then click the roller on the interesting audio track with no modifier (thanks Steve for that one)
I made some screen shots to make it clear, and will spread them in different posts, as I don't know how to post more than one pict in the same post.
I KNOW IT IS POSSIBLE TO GET WHAT YOU NEED WITH ALL KIND OF TRICKS AND I KNOW THEM! BUT IT IS A SERIOUS WASTE OF TIME!!! The snapshots are to make clear how absurd it can be. Of course, I overdid it there!
1.The start situation in trim. I want to keep the handle of sound on track 3 and 4 so I need to change the rollers direction there.