one friend asked me if it is possible to have start, middle and end markers coloured. The UI aparently only allows black markers. Then I looked at the svg xml and noticed that markers declarations are quite flexible. Is it only my impression, or we can indeed use as markers absolutly anything that is valid svg ?

I would propose that a color-selection button is placed to the right of each of the marker combo-boxes. (maybe even 2: one for marker-fill and one for marker-stroke)

Juca