In fact I was wrong, the option is already implemented
Just click on this button, and you activate the multi selection mode:
Independently from this, note, of course, that you can drag and drop multiple files from WaveLab’s file browser, or from your operating system file browser.
Thanks for the image. Engaging “Select Multiple Files” indeed allows one to select multiple files, but to select them one has to click them one-by-one. In contrast, I was talking about selection of a continuous range of items by Shift+cliking the first and last items of a range of items.
For instance, my current project contains 143 audio files and a few montages. I wanted to insert files 37–63 into one of the montages and painfullly realized I had to click them one-by-one to do so from the Project Manager.
I know I can do this from the File Browser as Shift+clicking does work there. But I like the idea of project you’ve implemented in the recent version of WL and wish it to work smoothly. The Project Manager differs from the File Browser in that it allows one to consolidate a list of files from different drive locations. That’s a benefit. Thus my request to extend the functionality of item selection in the Project Manager.