not sure what you mean by system menu... "environment->settings->interpreted languages" lets you add actions for files that will populate the right click context menu (for files only at this point, working on directory implementation as well). actions can be things like spawning Nautilus/Windows explorer, running interpreters, image viewers etc
I mean the file/directory system context menu.
I don't know how it works on Linux but on Windows if you click right mouse on file/directory, there appears a context menu with things like "...,Send to, Copy,Cut,Delete,Rename,Properties,..." and applications add their own context submenu to this menu. For me, the most important is "ClearCase" (my versioning system) submenu , which I use almost everytime, mainly from TotalCommander.
I thing it would be really good to give users of the CB the ability to acces the standart system context menu.
At least, the "hard menu work" is alredy done, so why not to make it public and just use it?
Maybe a new line "System context menu..." could be added to your File Explorer menu.
Also, it would be really nice if the same is added to the document context menu.