You most certainly can add graffiti ability to the treo if you choose to do so.
Handspring offers a free copy off recoechoplus that you can download from their site and there are others offered such as NewPen.
Recoechoplus:
http://palmgear.com/software/showsoftware....964&prodID=3766
NewPen:
http://palmgear.com/software/showsoftware....64&prodID=42632
Having been a palm user for many years and used graffati, it took no time at all to get used to the querty keyboard on the treo and quit frankly I much prefer the keyboard over graffiti at this point! But than again, I don't wear bifocals!
:D