Well, theoretically this could be done by the GPS, but the response time would probably render is useless if you tried to use it on demand. GPS also can't take into account slants in the road.
A G-meter would make a useful pugin in itself, but is beyond the scope of this plugin (for now).
I don't know how I could easily pick up the gear you are using. But that would make for some great recording data...
I've nearly finished adding Quarter Mile, One Mile and Top Speed performance testing. just have to code the front end now.
The plugin is no doubt full of defects so it would be great if I could get some people to do some 'testing' for me before I go unleashing dodgey code on the public. Would anyone like to give me a hand?