1- All the marker type has color filled shapes. We need a circle marker type that either has no color filled i.e edged circle or we can change the inner color of the circle. image link: http://screencast.com/t/snOfeQ7Z
We have just implemented this feature. Shortly we will send you an internal build over email.
2- I need line marker type with adjustable line length. image link: http://screencast.com/t/a48Pr20A7U
Sorry, line markers are not available yet.
3- I also need a way to align legends vertically rather then legends in a row. image link: http://screencast.com/t/xkSDDx9Q