I have been using the front brake on my E-Zip. It has a suspension fork which is more forgiving. This one does not have a suspension fork yet. I not worried by any means of the over the bars flip. I don't think that would even be possible without conscience effort to do so. But I have had the front rim lock up before the rear and caused some squirrely sliding on a several non-motorized bike without suspension fork at 10 - 15 mph. On a motorized bicycle going 20 - 30 mph, I want some degree on control and predictability. When I get a suspension fork on there then I'll put a front brake on there.
Building 2nd kit in 6 years. Cheez this time. 1st one was a DAX.