Dialogs and keyboard on Mac

[Bennett Helm]

LyX-1.5, unlike LyX-1.4, does not allow easy navigation through  
dialogs with the keyboard.

In 1.4, it was not possible to type shortcuts to directly select  
buttons in dialogs. (This is not something that applications on Mac  
generally do, and I don't know whether it's supported by Qt/Mac.)  
However, it was possible to use the arrow keys or tab key to move  
among the options, hitting <return> to select.

In 1.5, it's not possible to use the keyboard to navigate to buttons.  
(<Tab> still works to navigate to text fields, however.) For example,  
in the Insert Citation dialog, it's possible to tab to the Available  
Citations list and then type and use arrow keys to select a  
particular citation; but it's not possible to select the "Add" button  
except with the mouse. Is this a general limitation in Qt4/Mac? Or is  
there something that can be done?

(I've tried messing around with Qt's Designer, but don't see any way  
to fix this issue.)

Bennett