I've just checked that LaTeX supports the following "accents" for
mathematics.
\underline
\overline
\hat
\check
\tilde
\acute
\grave
\dot
\ddot
\breve
\bar
\vec
I think some are already implemented as math panel buttons, like
\acute , right? Some are _recognised_ by LyX but I still can't figure
out how to insert it directly in LyX, eg, \ddot{h}. I just know to open
the file with a text editor and add this manual and then reopen the file
in LyX.
Could you implement these accents, please?
Regards,
Seak T.F.