oozing question

Hello I have a RepRap Tricolor with 3 extruders, I have no problems when printing using one extruder, but I have problems when using two..

Slic3r creates a wall around the model, but can't I make like two walls? One for each extruder? This way it is garanteed that filament will come out once it starts with the model itself.. It is primarily due to this wall that I dont have problems with one extruder..

Can this be done?

Never mind, I figured out that all I had to do in Slic3r was to increase Skirt loops to 5, now it creates Skirt for all extruders.

Never mind, it seems that it only makes skirt with the second extruder in the first layer... After that it returns to only make skrit with the first extruder for all other layers.....

I think one way to do it is to include a custom G-code to prime each extruder when the print starts and/or when you change the tool (extruder).