But for the easy part first. You have to be running the SVN trunk build (pre 1.3.0) not the 1.2.0 base. Under the fog settings there is the ipxe boot menu. You must add a new entry then you can set the options to display the new menu item depending on the state of the target computer (new, undefined, all, etc [stating from my memory]). You can add in the iso image as I outlined below. Also @Wayne-Workman just updated a wiki about adding items to the ipxe menu.
Now about the part I’m not sure about. Do I understand that you want to remove most of the standard FOG menu items except for a select few? If that is the case you will need to edit the mysql database. Before I go into that, lets make sure that is what you want to do. (personally I don’t recommend this approach [tweaking the database] because there is no way to know how it will impact FOGs execution, stated as a non developer). Wayne kind of laid out what needs to be done to the database about midway down in this thread.
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You can only delete tasks from the active pages (by delete I really mean cancel). Do you see the checkboxes?
Under the “console” you also have elements so you can view the source. If you scroll near the bottom is the fog.task.js file loaded?