Modifiers for File Types context sub-menus

Hi there!
I'd like to have a modifier of the type @hideif or something similar —@hideifempty, for instance— for context sub-menus we can add in Directory Opus' File Types utility, so they don't show up in Lister context menus when there are no context menu items inside them or some condition applies.

My use case is the following:
I'm trying to create a customized Dropbox cascaded context menu that only contains the actions I use more frequently to reduce the clutter created by the original one. To mimic the original context menu items behavior, I would like this context sub-menu to only appear in case Dropbox.exe is running, and otherwise remain hidden.

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