You can use your walking foot (even feed foot) with zig-zag and decorative stitches if the foot was made for zig-zag machines.
But, some decorative stitches move forward and in reverse to complete the designs and with those particular stitches, the even feed is going to fight with the feed dogs to some extent and may result in decorative stitches that aren't real decorative. ;)
If you stick with the stitches that don't use any reverse, sewing with the even feed won't be any different than sewing with the normal zig-zag foot.