QUOTE(Koltz @ Feb 9 2007, 08:17 PM)
If the unit has a speed upgrade use the hero of that unit
EG Devouring one and zerglings
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That's the closest you can get without really altering gameplay.
Otherwise you'd have to do something really obscure like use a Queen to designate "Feet" and have your actual unit move to "Feet" every time they're a few grids apart.