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I want to replicate this behavior with a different file manager (PCManFM if that matters). Is it done with a .desktop file or is it built into dolphin itself? Thanks a lot!
I’m not sure I understood you clearly and completely, but I know that all those file managers have different policies and methods regarding context menu customization, and Dolphin seems to be the most accessible and straightforward, although there’s still room for improvement, particularly in terms of providing a GUI method for adding custom context menu items.
Basically, dropping a properly written .desktop file into ~/.local/share/kio/servicemenus (at user-level) or /usr/share/kio/servicemenus (system-wide) does the trick - plus an executable script, tool, app defined in that file.
Other file managers have a different way of doing it, and not all are so simple.