Automatic colouring of track categories

[elmuSSo]

I would like to have an option of automatic colouring of certain track cathegories. Eg: Plane track - black, Car - Red, Foot - Green. Of cours it would be perfect to have possibility to configure the colours. Now I have dozens of different tracks in different cathegories, and I n eed to give them colours manually, which is almost impossible with the color picker ( almost impossible to choose the same colour twice).