data handling

I use Graph mainly to graphically display experimental data imported from datafiles and view them superimposed.
It would be useful to name automatically each point series by an appropriate name (as the imported filename ) without the need to print everytime a different name instead of Series1, Series2, ....
It would be also useful if adding a new data set the colour of the graph could change automatically eliminating then the need to change it manually every time
Any way of doing it?
Thank in advance
Renzo