ya, i believe we can. But it will better if Yii has that widget, right? Lack of controls, IDE support will make users hard to use framework. I hope Yii developers have enough time and money to make Yii the best framework.
Yii is just in it's beginning phase, I believe it will be extended and expanded from time to time. I also will need to use a rich text editor so once i make a widget/extension i will be sure to post it here for others to use as well.