How can I change or add Preset Artboard sizes?

https://forums.adobe.com/people/Ton+Frederiks  wrote I was thinking about an Action. Fit Artboard in Window Create a rectangle of your desired artboard size. Cut it an Paste to get it in the center. Insert Menu Item: Object > Artboards > Fit to Selected Art Clear the rectangle. This will leave you with a resized artboard.

Taking your idea of an action, I elaborated on it a good bit.  I searched for a script that would automatically create a new artboard to the size I needed.  I found this one and edited the size to the size I needed:

tell application "Adobe Illustrator"

  if (count every document) > 0 then

  set numArtboardsBefore to count every artboard in document 1

  set newArtboard to make new artboard in document 1 with properties {artboard rectangle:{0, 1059.84, 680.4, 0}} -- left, top, right, bottom

  set numArtboardsAfter to count every artboard in document 1

  end if

end tell

Then, I needed to rename the artboard to something specific.  In my case, "Job Jacket".  So I asked for help with this script and someone kindly came up with this script that would automatically rename the active artboard:

// set a new name eg "Job Jacket" for the active artboard in active document 

var aDoc = app.activeDocument; 

var abIdx = aDoc.artboards.getActiveArtboardIndex (); 

aDoc.artboards[abIdx].name = "Job Jacket"; // set the new name here 

Then, I assigned each script to an action so that I could create keyboard shortcuts for them.

Now I can create the desired artboard size and rename it to the name I need with just 2 presses of a button!

Hope this helps anyone else that may be searching for something similar.