savageorange said:
To me that seems to express what you actually want.

Not exactly.

Well, first off, if you treat them as one tag that has to be included, suddenly a lot of search slots are taken up. In your example, four tags would be used, using very little for whatever actual searches would normally be going on. I think limiting it to one or two is more reasonable.

Second I think a certain amount of flexibility is fine, as long as there's at least some precedent there.