One of my platform applications I developed uses the OutlineView and TableView explorer views extensively.  The users generally like the application, but a common complaint I hear from them is that the way focus and data entry works in these components is very foreign to them.  These users (and many typical users in general) are used to the behavior of Microsoft Excel.

I request on their behalf that the OutlineView and TableView components try to match Excel's behavior where possible.  A concrete example of one difference is:

Excel: 
Tab to next field, type a value, tab to next field

OutlineView/TableView:
tab to next field, hit F2 to set focus, type value, hit ENTER to save value, tab to next field.

I realize that it may not be feasible to change the behavior of existing components, but I think this feedback will be more common as NetBeans Platform becomes more popular.