Hmm. I always thought that "sword" was just shorthand for "bladed weapon of your choice" or something like that, and not really a hard requirement. I was about to respond with words to this effect, too, until I read through this thread. Apparently the design intent really was to have magic swords outnumber all other magic weapons by like 10:1.
I don't really know what to say to that. I mean, I've been placing all kinds of magical, re-skinned "swords" for years and haven't found any issues. Our fighter is currently using a glaive of wounding, and the sorceress is quite fond of her dancing dagger. (shrug) I don't feel compelled to change them now, or to change the way I've been placing treasure.