jacknash Just use menulibre
. Install it and you will find it as "Menu Editor" in menu. With this tool you can create a desktop launcher, then you can add it to "Icon Task List". There are already a lot of posts in the forum that explains how to use it.
Another option is to make manually a desktop file as vncviewer.desktop
for example and save it to $HOME/.local/share/applications/
EDIT: You can use this desktop file that I found:
[Desktop Entry]
Encoding=UTF-8
Name=VNC Viewer
GenericName=VNC Viewer
Comment=Connect to computers running VNC Server
Exec=vncviewer %f
Type=Application
Icon=/usr/share/icons/hicolor/48x48/apps/vncviewer48x48.png
Categories=Application;Network;RemoteAccess;
MimeType=application/vnc-shortcut
X-Ayatana-Desktop-Shortcuts=NewConnection
[NewConnection Shortcut Group]
Name=New Connection
Exec=vncviewer