find-file annoyance

[Katsumi Yamaoka]

Hi,

When I invoke C-x C-f, clear the minibuffer, enter a remote file
name like "/frp.example.com:~/foo", and type C-a or C-b in order
to correct the host name to "ftp.example.com", I cannot move the
point to the place before "~" or ":".  Only <backspace> does it
but I have to retype the whole host name.  In addition, I usually
did `C-x C-f C-a C-k C-g' in order to copy the directory name of
the dired buffer to the kill-ring.  Is there a way to make it
behave like Emacs 22.1?

Thanks in advance.