ATMs, i have had trouble using my Thai bank card (gov't savings) but my canadian card always works. If you take out 2,000,000 your good for quite a few days.
never had any gas issues even with the KLXs 150k range.
Bring some tea bags, lots of little shops have those hot water dispensers so at least you can enjoy your tea.
I have trouble finding a decent breakfast so some kind of granola bars or snacks would be good.
Lots of hotels only have one plug, I always bring a small power bar so I can recharge my various gadgets at night.
In the summer lots of the roads north of vientiane were 100 meters of pavement, 100 meters of gravel, repeat all day. Doable on the Versey but a tad annoying. North of Odoumxai and to the west the roads are beautiful. Likewise the tarmac around Pakse Attapeau were very good.
I always carry a strong kryptonite cable and a Ulock for bike security. I found the hotel owners were more nervous than I and were happy to see me lock it up.
The hardware store downstairs in Tukcom now has the aerosol tire sealant/inflator, not sure how great it works but I am bringing a can next trip.
Duct tape, zip ties, fishing line, electrical tape, zip loc bags for camera, iphone,mp3s,,, map, chain lube, small bottle of glass cleaner for helmet visor, glasses and head/tail light lenses (Charoen optical sells nice little ones) 2 part epoxy, a few pairs of latex gloves(doctors gloves) so you can tinker and dont have to wash your hands. I also always bring a thumbdrive loaded with shows as laos TV can be boring and the evenings long.
If you cross at Vientiane there are two offices right there selling insurance, If you cross at Tha li the insurance place was closed the last two times I was there, but I got insurance in Pak lai. (side note, if you cross over often they have a good yearly rate and it doesn't matter if you go back and forth between countries, it stays valid)
Never had issues with Laos dogs, even on bicycle, I have no idea why they are more laid back than Thai dogs.