Just a very small and easy to implement improvement. Now, when a material is selected and added to the FE Model materials window, OK button remains inactive. It would be nice to move focus to this button. It allows a user to finish material definition and close window by simply pressing Enter (instead of moving mouse cursor to the OK button and pressing it) and does not prevent selecting other material.
Agreed; even the small tweaks contribute to making the user experience a lot more pleasurable.