I'm trying to imagine a tag with a wider meaning, so I created a table in which I put the different sports more or less competitive, grouping them in some way. For every sport for which there are typical facilities I put the common names with which these are called. https://wiki.openstreetmap.org/wiki/Proposed_features/Racing_facilities
I think I will go ahead with the proposal for motor sports and I could easily include those of animals but maybe with different tagging. Trying to consider also other sports seems very hard: I think bobsleigh centres deserve an appropriate tagging but I do not see many similarities with other sports. Maybe it's covered by piste: type but it does not seem well defined. There are some facilities such as velodromes that are clearly for racing but often resemble stadiums, as well as speed skating, which often also includes a field for other non-racing sports. Some cycling disciplines have a tracks similar to that for motocross, others are more free ride but still have a track. I also put skateboard that is not a competitive sport but you can practice on tracks. I hope all this helps. Lorenzo
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