[fel64]

I don’t know about spaces being more common, but commas make a lot more sense to me – it’s a list of items, and you couldn’t have tags consisting of more than one word if you use spaces. The reason it accepts commas is, I think, that you add tags like “tag1, tag2”, it explodes at the space and when the tag’s created the punctuation is removed automatically. Since this function isn’t pluggable, there’s no more elegant way I know to do this.