I don't know if it works for other people but I used to drive a stick shift and down shift when I get to the red light. I use the B Mode much the same way, except when the battery is 100% seems like the B Mode does't slow it down more (probably to protect the battery).
I decided to future-proof my purchase and went with the Clipper Creek HCS-60 for my newly leased Leaf. As I do plan on getting the new Tesla in 2017, which is rumored to be in the 35k price range.
The HCS-60 doesn't have a plug-in option but I don't foresee dragging around the whole charging...