What key is bound to Something?

Hi,

I maintain a filetype plugin to R and the user can change the default
key bindings by putting in the vimrc commands like:

map <F2> <Plug>RStart

How can I know in the ftplugin/r.vim what key is bound to
<Plug>RStart? The plugin adds a menu to gui versions of Vim and I
would like to tell in the menu all the key bindings, even the
customized ones.

Thanks,

Jakson Aquino

Note: the plugin is here: http://www.vim.org/scripts/script.php?script_id=2628

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