Just now taking short ride outs on a newly delivered Rad Mini Step Thru. Really enjoy the bike and the PA, but really what is the purpose of the Shimano gear shifter on this bike? The terrain around here is generally flat with mild hills. The weight of this bike doesn't seem to lend it to "normal" peddling (without PA). Is it more common for Rad power bike owners to just leave the bike in one gear and rely on PA for general cycling? I'm confused.