the only one that i found that really makes sense would be changing it for readablity ( like color blind
.
myself i find it annoying that a red con aggro mob is a bit harder to spot off the bat from one that isn't (hardly ever happens).
or if you wanted to give a custom glow to a interface/skin that you are working on. the file struct seems easy to follow. but using several lines to make the shadow. each bit does one thing, then says to go to another shadow maker in the same name.
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the ui editor even has a part for editing the shadows, how i missed it b4 i don't know. all it does is makes a second copy of the text, takes a new color and an offset. generally all the shadows have 15 steps to make them look nice (the aggro one and several of the other color ones) this is to get a 2px shadow all the way around.
i'll make a little example that i just had wonder cross my head after i wake up again.