Apparently it doesn't help much with DispVM startup time, but causes a
lot of problems when such app do not close in time (either can be killed
forcibly and will complain about it at next run, or will spontaneously
show itself when DispVM is started).
When /rw/home/user/.qubes-dispvm-customized is present use /rw/home/user
instead of default /etc/dispvm-dotfiles.tbz. Also make sure that /rw will not
remain mounted during DispVM creation.
