@Shinjidude: Just because practice shows a strong trend,...

Shinjidude
2011-10-27T11:24:41-04:00

Just because practice shows a strong trend, that doesn't mean an implication is a good idea. For an implication or alias to work we need to sure that the rule applies in 100% of cases.

If you can think of a situation where an image with a soccer ball or badminton racket exists, but tagging the sport wouldn't be warranted (say they appear in the background of a gym_storeroom or amidst debris in ruins or a junkyard.

If you can think of even a single plausible contrary case, a rule shouldn't be made and people should just add the additional tag manually where it makes sense.