The option to "Edit Application" is not available on applications QuickLaunch widget placed in the panel/aka tool bar/space beside the menu. For example add options for example changing start up options: kate -b %U to kate -b %U /home/me/*.txt Steps to reproduce: Find an app by typing (kate) in the K menu. Right click and select then "Add to [Desktop|Panel|Launcher]". On the Desktop and Launcher, right click the new icon and edit the application properties. In the Panel right click and there is no option to edit the application properties. Workaround is to add application to the launcher > edit it > add it to the Panel from there.
that wasn't actually about the quicklaunch but about the icon widget not exposing the desktop file properties dialog. this is fixed now.