Inline vertical align - capital-middle

Has the working group ever considered a value for the 
'vertical-align' property allowing one to align inline boxes 
centered to the middle of the capital letters in a text line vs. the 
current 'middle' of the small letters?

I find the former more useful than the later, as at certain ratio 
between the font size and the height of the box to align, the box 
may appear hanging below the text - see the attached example.  I 
would really like to have the box appear middle "balanced" to the 
text at different font sizes.

The closest I've been able to achieve is 'line-middle' (in the 
attached example) where both the box and the text get aligned to the 
middle of the parent line.  I don't like the side effect of the text 
being shifted off its main baseline, however.

Don't you think there's need of additional 'vertical-align' values 
like 'capital-middle' and/or 'line-middle'?

-- 
Stanimir