editing features for radio documentaries

Rather than merging the clips leave them in place where they are on their own tracks as you want them. Then instead of Merging the clips do a Mixdown to new track. This will give you the appearance and sound of the 'merged' clips without destroying any that you may need to redo later. You can then just Mute the tracks that the clips came from and just listen to the Mixdown version. A bit like pre-rendering a set of video clips.

This is the whole beauty of working in Multitrack in Audition which is what it is meant for, not just for music editing. All your work is saved as a session file which is non-destructive to the audio files and can be gone back to and changed at any time. the only time a new permanent file is created is when you Mixdown or Export.

As it is some musicians complain the opposite to you in that Audition is too orientated towards speech and FX editing for making music!

laurentK  wrote Hello, I am producing radio documentaries and can't find features, in an Audition CC Multitrack session, that are really needed for this kind of work (which do exist on more orientated radio production editing softwares). I went through Audition tutorials without success...

Audition is more widely used for radio editing than any other software on the planet, and has been for a long time. For you to claim that it's not as oriented as other software is slightly far-fetched, I'm afraid, and it's not exactly the way to endear yourself to anybody who might be able to help you...

Merging and un-merging clips in multitrack session: I would like to merge several clips into one single clip, to get the visual appearance of a single clip BUT I need to keep the ability to un-merge it in separate clips in case I need to make a new edit.  When clips are merged together with the 'merge clips' command, they become a new clip with no way back. Is there any way of getting a visual appearance of a merged single clip without physically producing a new clip ?

Yes, the 'merge clips' does this, and it also warns you that it's going to. But you will also observe that in the files list, the original clips are all still there, and since you would be attempting to remake your sequence anyway, it wouldn't be so much of a problem to put them back. What you are asking for is only a 'visual' effect; there's nothing functional about it. The norm is to create the mix sounding the way you want and mix that down to a single file, and save the session. If you need to go back, then all you need to do is re-open the session - no need to unmake anything.

Preventing clips in a group from crossfading with the next or previous clip when moving the group on the timeline: After grouping clips together (cmd-G), is there any way of blocking the clips inside a group from moving a bit or crossfading when I move the group on the timeline or on another track ?

This, on the other hand, shouldn't be happening. Others have commented on it, and we suspect that it's a bug that's being fixed; it doesn't normally do this at all. If you group clips, then the entire group should stay as you have it when you move it; there should be no relative movement within it at all.