Just thought I'd jump in here....
Yeah, Pete what you're describing seems like it would work. And kudos on a very thoughtful workaround! The only thing is that the user would have to always mentally divide in half the number of ticks he wants for the randomization range, since the other half will be compensated for by the delay parameter.
So, if he wants to randomize only later in time by up to 10 ticks, he'd have to apply a +/- value of 5 in the Transform window, and then offset by 5 ticks in the region parameter box. So it works, it's just a small extra mental calculation the user should be aware of having to make.
And BTW, this is a very cool feature in DP! 😀