Backspace doesn't work with customized keyboard

Hi all!

My case is particular and probably unique:
I'm on Linux Mint 14 and use a customized Dvorak keyboard layout
and I've remapped Backspace to the TAB key and Tab to the 3 key.
(see http://bepo.fr/wiki/Utilisateur:Lawrent#Disposition_compl.C3.A8te.2C_encore_en_cours_de_changements for my complete layout.)
My keyboard is remapped with xkb.

My problem is: when I press 3 to TAB a line,
my TAB key doesn't react as a backspace anymore
(pressing it has no effect anymore).
This only happens in a terminal (i.e: with vim and not gvim).

Does anyone know how to solve this?

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