This would be really great to have for a book I'm working on right now.
I removed ~/.config/libreoffice/4/user and reinstalled texmath from sourceforge....
Oh, also, every time I try to edit the formula, the rendered font-size increases...
Formulas don't change on edit in Impress Version: 5.2.2.2 Build ID: 1:5.2.2-0ubuntu2