Is that the official name for it? I'd find Sandstrider more intuitive.
Yep, so was the original term I wanted to use (Light-Footed). Unfortunately 2 of the races that have the ability, have lengthy special columns. So for chart printing purposes, the less intuitive, but shorter Strider was used...
No, that is definitely not the 'official' term, since there isn't one. Call it what you like, since the ability is gained on at least 3 different rationales (flys/is light/has ring of levitation), which are difficult to wrap into a single name.
That is actually an error. The UR subraces were going to be made such that you could only have one character utilizing that subrace at any given time (hence, "one use") but the idea was decided against.
All humans are liars, one of their own scholars has told me so.