Oh, security...sigh. Such a drag in the console.
For me, I had to enable Right-click options under the Security Role Manager. Go to Settings>Security>Permissions.
Choose the Role (Your Deskside Support Role) from the drop down and head over to Settings>Notification Server>Right-Click Menu. That is where these options should be. Then click the BLUE plus symbol at the top of the tree to add what you need. Once the new pop-up appears navigate to the above path to add what you need there.
I hope I explained it well enough. It is a tricky place to navigate. Make sure to make a copy of your role before you modify it.
My sample screenshot shows that I have only enabled Delete and Stop Task to the right-click options for that role.