Maybe I'm confused, but I want to be able to use ALL my keywords, and it seems to me that this suggestion would prevent that. I have multiple keywords per icon for a reason: one icon can be used for multiple purposes, and I may wish to switch one of the keywords to a different icon in the future.
For example, the icon I'm using for this comment has two keywords: "Doc7-frown" and "frown". I'm using the "frown" keyword, because the relevant usage is that it's a frown, rather than that it's the 7th Doctor. In future, I might have a different "frown" icon, and I would want this icon to still be "frown", even though it's a different icon. But in some other post/comment, I might want to use the "Doc7-frown" keyword instead. But if this were implemented, I wouldn't be allowed to do that, since, so far as I can understand, I'd only be allowed to have one "active" keyword per icon, since only the "primary keyword" would appear in the drop-down selection list.
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For example, the icon I'm using for this comment has two keywords: "Doc7-frown" and "frown". I'm using the "frown" keyword, because the relevant usage is that it's a frown, rather than that it's the 7th Doctor. In future, I might have a different "frown" icon, and I would want this icon to still be "frown", even though it's a different icon. But in some other post/comment, I might want to use the "Doc7-frown" keyword instead. But if this were implemented, I wouldn't be allowed to do that, since, so far as I can understand, I'd only be allowed to have one "active" keyword per icon, since only the "primary keyword" would appear in the drop-down selection list.
Do. Not. Want.