Since we cannot have dynamic jump list actions but this is an often requested feature and common among other desktop environments, at least add the "Places" to entries belonging to a file manager.
To avoid the menu becoming too long, the number of places shown is limited to 5* when the application is running and the menu would also have window controls. For when it's a launcher, all places are shown as there the menu is less likely to become massive.
This is added to services that contain the "FileManager" category, such as Dolphin.
*) It actually truncates it to 5 entries only if there's more than 7 places. There's nothing more frustrating than having a "reveal more" button that ends up adding just one or two items once clicked.