It is quite consistent. The regex to color the function deceleration is "green" (parent members will be blue) and functions actually being called are blue (parent members are not distinguished in this case).
Highlighting is kind a personal preference thing. I know some people who don't like too many colors and like to have things only minimally highlighted, also, I know people that like everything distinguished. I guess if enough people agree, you might be able to get it changed across the board, but I believe that unless the highlighting is blatantly flawed, you might have an easier time just modifying it and offering it has an alternative to the default highlighting.