Ok, but you can do this with a simple shell script without the reliance on Gnome/GTK:

  #!/bin/bash
  dir="/tmp/vim-anywhere/"
  fn="$(date -Iseconds)"
  [ ! -d $dir ] && mkdir $dir
  vim $dir$fn && cat $dir$fn | xsel -b -i

Then you just need to bind the script to a key inside your window manager.

Bonus: This works anywhere xorg is available.