nerdtree plugin to override 'o' and make it not reuse windows

nerdtree_custom_open.vim

"Demo nerdtree plugin to override the default 'o' mapping and make it not
"reuse windows.
"
"Chuck this in
"   ~/.vim/nerdtree_plugin/nerdtree_custom_open.vim
"
"or somewhere like
"   ~/.vim/bundle/nerdtree_plugin/nerdtree_custom_open.vim
"
"if using pathogen or similar.

if exists("g:loaded_nerdtree_custom_open")
    finish
endif
let g:loaded_nerdtree_custom_open = 1


function! NERDTreeCustomOpen(node)
    call a:node.activate({'reuse': 0, 'where': 'p'})
endfunction

call NERDTreeAddKeyMap({
            \ 'key': 'o',
            \ 'scope': "FileNode",
            \ 'callback': "NERDTreeCustomOpen",
            \ 'override': 1 })