chucker, to answer you first question, my wife's Canon A620 has custom WB setting as an option to you. I'm not sure where on the scale it fits, but not bad for a point and shoot.
Also, you are right about Grey Cards being widely used now in digital photography to correct WB errors. I've been through a good portion of class about how it will simplify the life if you shoot in RAW/TIFF. However, with something like custom WB on the Canon point and shoot you would have to wait until post production to correct the WB.
As odd as this is, I've never learned about using a Grey Card for proper exposure.
I understand it's where the idea came from, but it isn't taught in digital classes anymore.
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One who does not vote has no right to complain.”
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