Yesterday Chero and I were talking about keymapping and in particular how to activate the Insert key in NoteCase.  To enhance the ease of use and functionality of NoteCase, here is my personal solution:   
First get a full copy of the keymapping in pdaX by using 
xmodmap -pke > keymap 
Looking it up I found keycode 111 matching "Insert", which is not mapped yet. 
Next add a line for this keycode 111 in /etc/X11/kb/userdefined.xmodmap. 
As there are two Shift keys and the right one is less used than the left one, I choose to map R Shift to Insert with Fn. It looks like this:
keycode 111 = Shift_R Shift_R Insert Inser
This way pressing R Shift I can still get the normal shift, and Fn+R Shift will do an Insert. 
So, in NoteCase, to add a new parent branch, I do Fn+R Shift (= Insert); to add a child branch, I do a L Shift+Fn+R Shift (= Shift Insert).  I squeezed my big left thumb on both Fn and L Shift, and press R Shift with my right one. Volia!   
  
I also reassigned F1-F5 to Fn+5-9 (so no meddling with Fn+1-4 for zoom and backlight), and Fn+0 to F10. Now all the major hotkeys for NoteCase are available.  And this also comes handy in other apps like mc.
Hope this helps.  Enjoy.