ctrl w behaviour: jump in front of separating characters?

["chiasa.men" <chiasa.men@web.de>]

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my $WORDCHARS is set to ''.
Consider the following path: ls -l -a --color /long/path/with-some-things/to/
consider.txt
the following lines represent the modification by pressing ctrl + w each time:

ls -l -a --color /long/path/with-some-things/to/consider.
ls -l -a --color /long/path/with-some-things/to/
ls -l -a --color /long/path/with-some-things/
ls -l -a --color /long/path/with-some-
ls -l -a --color /long/path/with-
ls -l -a --color /long/path/
ls -l -a --color /long/
ls -l -a --color /
ls -l -a --

What I actually want is that it goes from
ls -l -a --color /
to
ls -l -a --color
and after that to
ls -l -a

is that even possible just with setting the WORDCHARS accordingly?
It seems the problem would be solved by jumping before the separator and not
staying behind it
That would result in the following sequence (I guess)
ls -l -a --color /long/path/with-some-things/to/consider
ls -l -a --color /long/path/with-some-things/to
ls -l -a --color /long/path/with-some-things
ls -l -a --color /long/path/with-some
ls -l -a --color /long/path/with
ls -l -a --color /long/path
ls -l -a --color /long
ls -l -a --color # mind the blank, which is unwanted too
ls -l -a # that unwanted blank again


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