Override menu shortcuts [closed]

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By default Alt + h will bring up the help menu, and alt + i the insert menu. I'm trying to imitate vim-like navigation by setting shortcuts for alt + h = navigate left, alt + j = navigate down etc. This is not possible though, since alt + h will still open up the help menu.

Is it somehow possible to override the menu shortcuts with customized ones? If possible, I'd gladly disable the menu shortcuts altogether :)

I'm running LibreOffice 4.2.7.2, now primarily Writer, on Ubuntu 14.04.