I had a client style that included underlined text, however the actual text had to be 100% black and the underline had to be 75% black (this was outside a table). Ideally, in the text rule styles section of the JT/DT, two additional form fields would exist where I could specify a number from the color spec defined earlier in the job ticket as well as a pattern/shade:

Underline #1
Thickness: 0.5q
Placement: baseline
Offset (leading): none
Offset (numeric): 0.5q
Skip: nothing
Color: 1
Pattern (%): 75

I have seen this in two different client styles so far this year and he "hack" has been to enter something similar to the following (however I'm hopin for something a little cleaner):

{text}<co;75><ul;1><co;1>The xybase2 style<ul;0> bundle provides a variety of page and typographic styles.