Sorry stargazer, but things must be very different on your side of the pond. Whilst I am not qualified to talk of piloting things I have to raise an eyebrow or two at some of your comments. But when it comes to ATC, then I'm in my element.
There are few rules about taxi speed - I suspect professionalism is usually sufficient to ensure that taxi speeds are kept appropriate to the situation (and that means for all aircraft in the area). Although controllers may think to themselves 'that looks a bit fast', in most cases they will not intervene unless there is some immediate danger.
Your attitude seems to be 'I'll see what I can get away with and if it's a bit dangerous someone will tell me'.
Like I say, things seem different on your side of the pond ... and not for the better.