classic,
As far as I know there's nothing in the official API to do this.
But if you're really keen on the idea, and are using C# or VB.NET, it
would be fairly trivial to add this feature to this little tool I was
developing pre-API:
http://www.googlemappers.com/libraries/gcalapi/
You could add a method to GFormMain called QuickAdd(text as string),
making use of the WebPilot called wp to do the following:
1) Click the link you get back from FindElementById("open-quick-add")
2) TextBoxes("quickadd").Text = "your quickadd text"
3) FindElementByTagAndAttribute("INPUT", "src",
"images/btn_add_quick.gif")
1, 2, and 3 correspond to the "Quick Add" link, the textbox that pops
up, and the plus button beside it.
I'm assuming you're using C# or VB.NET.
Let me know if you need more help (but do try digging in to it a little
first).
Cheers,
Richard