I would like to see this as well. I work on multiple jobs at once (since many are in the proofing cycle) and am unable to deactivate fonts. Plus, activating and deactivating fonts in Suitcase takes time when dealing with as many fonts as I do, especially when I work on so many projects a day. Having a palate of some sort would hasten this process. Quark does take some time to adjust to my font activation/deactivations when done so often, as well.
Aloha!
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