The tags example link points to localhost. I guess you meant this page
Any ideas for other useful tags, stuff you might want to search for in an archive, for example?
Your list is a good start, specially because I believe most of the interesting tags not on your list would require reimplementing Stunts' pathfinding algorithm - for instance, identifying pitlanes (as in LeStunts), clockwiseness or, for that matter, dual-way tracks discounting scenery roads.
The illusion and road-on-water tags could come in handy for a track-sharing site (in the vein of stuntschallenge.net or even Luke's
), as they would make it possible to tell whether it is sensible to open the track in the in-game editor. (A car ghost tag would be necessary too). As for illusion tracks, keep in mind there are two kinds of illusion effects: those reached by filler tile manipulation and those achieved by placing elements in terrain pieces they were not supposed to be. While they are often seen in conjunction (as in Krys' classic illusion tracks), terrain manipulation can be used to reach more subtle effects, such as fitting a large corner tightly around a hill edge (I uploaded a lap in GATE.TRK, an SDR '07 track which has an example of that).Edit: Oh, and of course: the obvious extension would be implementing replay tags so that we might look for car, colour, game version, etc.