[AUCTeX] Question of a font problem.

[Adam Johnson]

Hi,

I just have a question of font in AUCTeX.  In the following math environment
$A_\mathrm{med}$
The font of {med} is normalsize, but it should be scriptsize.
$A_{\mathrm{med}}$ can give a correct result.

However, both methods produce the same output, but the fontface are 
different.  I know that maybe it is difficult to be corrected because in 
$A_\theta{B}$ (not good writing style, but some use this way.) then ${B}$ 
should be normalsize.

Is it a better idea to redefine "_" to "_{}" in AUCTeX and place the cursor 
between "{}" if it is not "\_"?
Similarly to redefine "^" to "^{}" if it is not "\^"?

Thanks.

BTW: I'm using AUCTeX  w/ preview-latex11.81
                        MikTeX 2.4
                        CVS Emacs 22.0.50.1
                        Windows XP.
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Best Regards,
Adam