Hi,

Is it possible to add the "Shell Menu" option (that is available in the Workspace tab when you right-click a file or directory) to the context menu of the filename tab(s) above the editor (the one that shows "Close", "Close all but this", etc) ???

I'm using a version control system that requires me to explicitly check-out a file before editing (which can be done via the Shell Menu), but when I'm following links in the editor area (via "Find Declaration" for example), I can't edit the target file without looking it up in the directory structure of the Workspace tab...

It would very much help easing my coding-life

yes, you can add custom commands there too.
See "Show this command in File Bar popup"

Okay, this option lets me add custom submenu commands (which is cool!), but is there a way to show the *entire* "Shell Menu" context menu?
I couldn't find the option for it there...

No, Shell Menu can't be added there. I'll check if we can do this in next major verison.