If the only damage to the tyre is a small neat hole then i see it as there is no damage to the strength,safety of the tyre,at worst it will just leak.Now if you saw ripped thread then that would be differentAre the roads dry and dusty like this MT09 ride ?http://www.youtube.com/watch?v=YEgfQixwlV8&t=80
Was it a mushroom type plug? Maybe unlikely if you repaired it roadside as I thing you need to take the tyre off but could be wrong.The hole is in the centre of the tyre. If its in a sidewall it wouldn't be repaired by a dealer. I'd keep riding if it was mine. I've had tyres plugged by dealers who would quite have happily sold me a new one but they reckoned they were safe enough.
I like the idea of these plugs and gas canisters to get you home, are there good and bad makes or is one as good as the other. I'll have to get me one.