hi Joe...Not sure, as you say, on the technical feasibility, but I would certainly vote this idea up. I also think Tableau does a pretty good job of keeping the font visible for light and dark bars, but when the text goes over the bar (which I encounter quite a bit...in retail there is always a 'tail' of products/stores which are negligible but need to be shown as they contribute to the 'whole'). I've had quite a few occasions where I've adapted the colour scheme from what I wanted to use, and then 'hard' coded the font label colour and have it visible both in and out of Bars.
I'd be happy this be the default behavior (how the light and dark are currently handled) and then a way to turn it off in some obscure settings menu. I'm always hesitant of adding too many 'tick boxes' in the main formatting controls, but would probably want the ability to turn it back on some occasions.
Let me know if you do create the idea and I'll get voting!
You might also want to take a look at a new feature that we added to the product not too long ago. On the Marks Card if you expand the label options, if you open up the font settings one of them is "Match mark color". That will attempt to make the label text match somewhat closely to the mark color. I tried it on a few of the sheets in your workbook and it improved the results on those sheets.
Well that's new.
It's a 9.2 feature, for the record. I gave it a try in 9.2. This could be helpful, though part of the struggle I'm trying to address is when the label crosses from one color (dark bar, for example) to another (light background.)
I'll keep that for my bag of tricks when we upgrade.