I have it like this:
Yen > Delete
Non-conversion > Space
Conversion > Space
KANA > Space
Back slash > Shift
They will remain like this until I can get used to the small Back Space, Shift and Space keys.
Show Image
(http://i.imgur.com/HzMF9Fe.jpg)
I will try the following later:
Non-conversion > Delete
Conversion > Back Space
KANA > Enter
Almost the same as you.
Just i got double backspace at the top and left of the space bar i have win key because mine has FN key on the left, so no win key on the left. Aaand the ones on the right of the space are of no use for me.
The shift and win keys are what bugs the most. ATM i am really mad at the shift. Hate the enter as well...