Thanks to Alberto Ferrero, who contacted me on mail, I implemented today the possibility to add an index after parentheses. Until now the Math-o-mir missed this most basic feature. Thanks Alberto.
At the moment, the new Math-o-mir (v1.52, build 4) can be downloaded from : http://dl.dropbox.com/u/22438441/mathomir.zip (soon, I should be able to declare it official version, and add it to the homepage).
The index can be added the same way as with variables or functions. You right-click the parentheses to open the context menu and then click at the “Have index” option, or you can hit the underline ‘_’ key just after you entered parentheses (just after the parentheses object).
One more thing… I just wanted to mention this Math-o-mir ‘review’ because it is not completely copied, but at least contains few intrinsic words of the reviewer : http://freeallsoftwares.com/2011/02/math-o-mir-mathematical-calculations-software/