That last one is a good one...I actually just learned that method from the guys at the Itten dojo near Harrisburg. Budd can elaborate on it.
The other thing to keep in mind as uke is that if the throw into the pin is competant, shite is in a dominant position to strike, knee, deploy a weapon, etc. If uke chooses to scramble at that point, uke is already working at a serious disadvantage, and it's likely that you will have shite with a knee on your chest raining down blows. Which blows...if you get what I mean...