You can issue -help to get the switches:
/Library/Application Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -help
But here's the output:
JAMF Helper Help Page
Usage: jamfHelper -windowType [-windowPostion] [-title] [-heading] [-description] [-icon] [-button1] [-button2] [-defualtButton] [-cancelButton] [-showDelayOptions] [-alignDescription] [-alignHeading] [-alignCountdown] [-timeout] [-countdown] [-iconSize] [-lockHUD] [-startLaunchd] [-fullScreenIcon] [-kill]
-windowType [hud | utility | fs]
hud: creates an Apple "Heads Up Display" style window
utility: creates an Apple "Utility" style window
fs: creates a full screen window the restricts all user input
WARNING: Remote access must be used to unlock machines in this mode
-windowPosition [ul | ll | ur | lr]
Positions window in the upper right, upper left, lower right or lower left of the user's screen
If no input is given, the window defaults to the center of the screen
-title "string"
Sets the window's title to the specified string
-heading "string"
Sets the heading of the window to the specified string
-description "string"
Sets the main contents of the window to the specified string
-icon path
Sets the windows image filed to the image located at the specified path
-button1 "string"
Creates a button with the specified label
-button2 "string"
Creates a second button with the specified label
-defaultButton [1 | 2]
Sets the defualt button of the window to the specified button. The Default Button will respond to "return"
-cancelButton [1 | 2]
Sets the cancel button of the window to the specified button. The Cancel Button will respond to "escape"
-showDelayOptions "int, int, int,..."
Enables the "Delay Options Mode". The window will display a dropdown with the values passed through the string
-alignDescription [right | left | center | justified | natural]
Aligns the description to the specified alignment
-alignHeading [right | left | center | justified | natural]
Aligns the heading to the specified alignment
-alignCountdown [right | left | center | justified | natural]
Aligns the countdown to the specified alignment
-timeout int
Causes the window to timeout after the specified amount of seconds
Note: The timeout will cause the the defualt button, button 1 or button 2 to be selected (in that order)
-countdown
Displays a string notifying the user when the window will time out
-iconSize pixels
Changes the image frame to the specified pixel size
-lockHUD
Removes the ability to exit the HUD by selecting the close button
-startlaunchd
Starts the JAMF Helper as a launchd process
-kill
Kills the JAMF Helper when it has been started with launchd
-fullScreenIcon
Scales the "icon" to the full size of the window
Note: Only available in full screen mode
Return Values: The JAMF Helper will print the following return values to stdout...
0 - Button 1 was clicked
1 - The Jamf Helper was unable to launch
2 - Button 2 was clicked
3 - Process was started as a launchd task
XX1 - Button 1 was clicked with a value of XX seconds selected in the drop-down
XX2 - Button 2 was clicked with a value of XX seconds selected in the drop-down
239 - The exit button was clicked
240 - The "ProductVersion" in sw_vers did not return 10.5.X, 10.6.X or 10.7.X
243 - The window timed-out with no buttons on the screen
250 - Bad "-windowType"
254 - Cancel button was select with delay option present
255 - No "-windowType"
