Did you ever want your block attributes to have Background Masking and/or be able to stack fractions?
In AutoCAD 2009 (and maybe even 2008 ) and up, simply set the attribute to have Multilines, which uses MText, it will then be able to have background masking and fraction stacking.
Enjoy!
One more additional tip.... There is a system variable called ATTIPE (ATTribute InPlace Editor) controls the display of the in-place editor used to create multiline attributes.
0 - Displays a limited in-place editor that includes only a few formatting options
1 - Displays the full in-place editor with all formatting options