Upon further reflection, I've concluded that the problem I described is more of an annoyance than a serious problem. Although the hub connection is not very secure, the only times that it's caused a problem is when I have to remove the front wheel and/or transport my bike in my car. It still seems to me that some sort of plug or spade connector would be more secure than simply inserting the wires in a hole, perhaps there is a logical reason for the design that I'm not aware of.