When there is no rock/box/big stick/large friend nearby, yes, just lay it down. But think before you do - vent tube for the battery should be UP, and watch to see if any acid tries to leak out the battery top caps etc, also watch for oil pouring out, and make sure the gas is off. The carb may leak, that's ok.
The "'flat repair and inflater'" in a can" suck. Bulky and unreliable. I even had one leak all over the inside of the pack it was in. major
Sadly, the best method is to just fix it the old-fashioned way. There are a number of links to how to on the links page.
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Grant Johnson
Seek, and ye shall find.
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One world, Two wheels.
www.HorizonsUnlimited.com