Yes! Thats a great idea.
Toolbar is now split into multiple bars. As you can see on the screenshot the different groups (Mechanical, thermal, ...) of constraints also have separate toolbars. This way the user can choose which toolsbars he wants to show/hide depending on what physics he uses most often. An alternative abbroach would be to add submenus to the toolbar just like I did it in the menubar. But I think that would not be as useful and would effectively make the menubar redundant.