ZenBicycle,
I am also looking to install an in-line connector in the tail-light feed and like the looks of the Conxall. Can you elaborate on the specific model connector you are using? I've got a Supernova E3 taillight that uses 2 individual conductors (~22 ga each) inside a piece of heat shrink tube. I'm uncertain how the strain relief connector will function with this arrangement (non-cable) and whether the conductors themselves can be adequately secured to the connector pins.
Also, anyone have a good source for the spade connectors for a Schmidt dynohub?