I put kickstands on all my bikes, folding and non-folding, that didn't have one. I also put a golf ball into the end, for soft surfaces like sand. An aluminum alloy stand does not weigh enough to worry about. I figure it looks more "dorky" to lay a bike on the ground than riding a bike with one.
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"Whenever I see an adult riding a bicycle, I know there is hope for mankind." (H. G. Wells)