+1 too !!!
And second question about PVA, I don't find the option to use the prime tower for both extruders during all the print.
In my case, the prime tower is used only for the head just before printing. If the 2nd head have not to print sommething during some layers it doesn't use the prime tower. It's a big problem with PVA which carbonize into the nozzle if it stay too long at high temperature.