Description of problem:
When the candidate window is displayed vertically, Left/Right key to move the
selection on the candidate window isn't intuitive. and no way to change the
keybinding for it. ideally it should be changed and following the orientation
would be better.

Version-Release number of selected component (if applicable):
scim-hangul-0.2.2-5.1.fc6

How reproducible:
always

Steps to Reproduce:
1.turn on the "Vertical lookup table" option on scim-setup.
2.input something and press F9
3.move the selection
  
Actual results:
Left/Right keys are the keys to move the selection on even the virtical
candidate window.

Expected results:
Up/Down keys should works.

Additional info: