This topic is sooo 2006... perhaps time to bump it up a little ;-)
I bought myself a Samsung SyncMaster 2232BW and managed to fiddle around with Picasso96Mode for around 2 hours...
I was about to give up, pressed the last mouse button and *PLING*... there it was... 1680x1050 on the Amiga, and I must say, it's awesome! :-D
Lemme know if someone needs a screenshot of the Picasso96Mode settings. I'd be happy to post it.