Create an icon in activities tab.

edit

It sounds to me as though you're wanting to create .desktop file. I'm not sure what you mean saying it will set up cron jobs because I would think once you've set them up you're done and maybe you make a script to do it but you don't need a shortcut to it. However, to get a shortcut in the activities tab:

Gnome will create shortcuts for programs/scripts or whatever that have .desktop files. Gnome will look in a few different places but you should probably put your own into

/home/your-username/.local/share/applications

This is my .desktop file for Skype, you will just need to change the variables appropriately:

[Desktop Entry]
Name=Skype
Comment=Skype Internet Telephony
Exec=/opt/skype/skype %U
Icon=/opt/skype/avatars/skype.png
Terminal=false
Type=Application
Encoding=UTF-8
Categories=Network;Application;
MimeType=x-scheme-handler/skype;
X-KDE-Protocols=skype

Also, happy Easter, He is risen!