ctrl-b to box in text mode

vim/checklist.vim

@@ -2,6 +2,7 @@ function! Box_clear ()
     mapclear!
     map <space> :<C-U>call Flip_box()<CR>
     map b i[ ] <ESC>hhh
+    map! <C-b> [ ] 
     set laststatus=2
     set statusline=%f\ %=\ \[ChkB[x]\ spc,b]\ (%v,%l)
 endfunction

vim/vimbox

@@ -1,7 +1,8 @@
 #!/bin/bash
 function helpexit() {
-    echo Edit a file with check list mod of vim
-    echo "key 'b' adds a checkbox, space toggles the box"
+    echo Edit a file with check list mod of vim.
+    echo "Key 'b' inserts a checkbox, space toggles the box."
+    echo "Ctrl-b in editing mode inserts a checkbox."
     echo All switches are passed on to vim.
     exit
 }