I always carry a 30cm length of double sided velcro around the frame so when I stop I pull the front gear lever on and wrap it around the lever. I do also cable lock the wheels together before anyone says"is that it"
and for night time the BEST COVER is a BBQ cover from your local hardware, there light, water proof, cheap, dark coloured and some how seem to be tailor made for push bike.
Thats what works for me
Enjoy
Sam