I like changing the rates of shots, as annoying as that is, so for me using the ‘R’ key to change the rates of clips just by dragging is uber cool.
In the process of finding these short cuts, I also learnt the difference between a ripple edit and a rolling edit: a ripple (‘B’ for whatever reason) affects the whole sequence, moving any media past the edit point forward or backward to compensate for the change. Conversely, a rolling edit (‘N’, because sure, whatever) doesn’t do that, simply absorbing the edit by changing the length of only the relevant media.