That afterburner bug I think was fixed in 1.0.6. If not, it's definately a known bug.
In any case, I don't have any hard numbers for you, Az, although I do know that it is calculated as a percentage- afterburners work better on fast ships than on slow ships- it's not a simple +100 speed/accel. That said, from playing the game, my estimate of the percentage is in the neighborhood of 25%-50%, although I'm thinking 25%-33% is the most likely.
Lets see, how to test this, hmm. You could give yourself two weapons of known speed, 1 matched to your ship's top speed, and the other to various percentages of that speed. Fire weapon A, and it should just stay with you. Hit the afterburner, and it should be left behind. Fire weapon B now, and if you guessed right, it will stay with you. That would work, but I think it would take awhile. However, your results would be really accurate.
I don't have time to do it- this would be a great project for all you new plug builders to cut your teeth on, though
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~Charlie
Sephil Saga Homepage: (url="http://"http://www.cwssoftware.com")www.cwssoftware.com(/url)