Currently F12 cycles between the existing keybinding sets (default, emacs, 
viEdit).  You can always confirm which keybindings you're using by looking 
at the lower-right of the status bar. 
If those bindings are insufficient, feel free to update the relevant files 
as needed:
  abi/src/wp/ap/xp/ap_EditMethods.cpp
  abi/src/wp/ap/xp/ap_LB_viEdit.[cpp,h]
  abi/src/wp/ap/xp/ap_LB_viEdit_c.[cpp,h]
  abi/src/wp/ap/xp/ap_LB_viEdit_colon.[cpp,h]
  abi/src/wp/ap/xp/ap_LB_viEdit_d.[cpp,h]
  abi/src/wp/ap/xp/ap_LB_viEdit_i.[cpp,h]
  abi/src/wp/ap/xp/ap_LB_viInput.[cpp,h]
Enjoy!
Paul