Allow custom command for 'Add to Panel'
Some distros like Zorin Lite, provide plugins like DockbarX, which shows a Windows-like or LinuxMint-like icons for active applications (its not just lanucher, its a hybrid of launcher and active applications), also some users use xfce4-docklike-plugin which provides kind of same functionality. In these cases, clicking "Add to Panel" from whiskermenu on any application, adds it to panel as a a launcher, that too at the end of panel, it would be beneficial if a custom setting is provided to provide a command to invoke when 'Add to Panel' is clicked, sure the default would be the current method to invoke xfce4-panel's add launcher function. So, that way, any custom distros using custom plugins or any users custom plugins for dock or taskbar plugins could provide their respective custom commands in WhiskerMenu's settings.