One thing that disturbs my workflow with Unity is that I can not right-click on items in the "file browsing mode".
For example, if I want to open a photo not with EOG but with Shotwell Editor, I first of to open the file by left-clicking on it, and then select "Edit with ...". Simply right-clicking on it would be much easier.
The menu could be implement to look similar to those when you right-click on a launcher icon. Are there any plans to implement such a functionality?