It would seem that the Rollovercolora parameter (ie. the rollover alpha) is ignored on many/most Basic Widgets palettes.
I was going insane for a good hour there… is this a bug?
This is a bug. Putting it in the queue.
The nasty thing I discovered on further research is that instead of using Rollovercolora, it’s using Rollovercolorr for alpha!
Best stick with greys for now 
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