When creating an X-Y Chart with point symbols shown, the 'cross', 'plus', and 'star' symbols are obscured by the fill, which is set to be completely opaque.  There is no 'transparent' colour easily available on the colour selector dialog, and one has to go into the custom colour chooser to turn the opacity down to zero.  As one cannot also save this colour back to the colour selector, it means that you have to go through the custom colour chooser for each series' points that you want to make transparent.

By changing the top row of the colour selector into two buttons, 'Automatic', and 'Transparent', this would be easily available to anyone that wanted a purely transparent fill.  Also, a 'save' button on the custom colour chooser would allow the user to save a colour into bottom row of the colour selector, which is already provided for this purpose but which lacks any such functionality.