A DESCRIPTION OF THE REQUEST :
Under both the old Caspian and new Modena stylesheets buttons have disproportionate sizes relative to their icon. Under both stylesheets the buttons appear to have a much wider aspect ratio than would be expected for a normal button.
http://blog.idrsolutions.com/wp-content/uploads/2014/03/toolbar.png

This makes JavaFX stand out in a bad way compared to other frameworks. Swing's own default look and feel had more appropriately sized buttons for toolbars.
http://www.java2s.com/Code/JavaImages/ToolbarDemo.PNG

JUSTIFICATION :
Most applications and UI frameworks have buttons that are proportional to the size of their icon.
Windows Forms:
http://visualcsharptutorials.com/images/windows-forms/toolbars-1016.jpg
GTK:
http://zetcode.com/img/gui/sharpgtk/toolbar.png
Qt/Mac:
http://image.slidesharecdn.com/dd09makeqtappnative-091201053102-phpapp01/95/how-to-make-your-qt-app-look-native-70-728.jpg?cb=1261473165

Further the HTMLEditorKit under both stylesheets has button sizes that are appropriate to the aspect ratio of their icons.
https://docs.oracle.com/javase/8/javafx/user-interface-tutorial/img/editor-initial.png

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I would like to see buttons have a more common size that is relative to the aspect ratio of their icons.
ACTUAL -
The buttons are really wide and not appropriate for toolbars.

CUSTOMER SUBMITTED WORKAROUND :
The current work around is to override the default stylesheet and change the padding for buttons. But the issue at hand is changing/improving the default common style of JavaFX applications.