Re: Maintain speed until.......
If you're told maintain an airpseed until the fix, after you cross the fix you can fly any speed you'd like. As far as maintain until x miles, I'd assume DME since DME distance is more or less the go to distance measurment in ATC. If ATC isn't being too specific it isn't an imminent problem and more of a safeguard. If it is THAT big of a deal, the controller will tell you X miles from the threshold etc. Also, about the maintain X until at Y then faster... Were you in a King Air behind a Cub and in front of an 767? Sounds like some controller might have had some choice words with the guys in approach control for that sequencing.
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