The Qt thing we use does not propose such api (unless we show all hidden files, which we want not).
To be able to show your volumes as a regular folder at root, please do this change to your /Volumes folder:

Open a terminal and type:
* xattr -d com.apple.FinderInfo /Volumes

Basically, this command remove the com.apple.FinderInfo attribute from the folder, which make it visible as a regular folder.
Restart Monkey Studio after the change.