QtPlasmaC backplot for previous cuts

I have just changed from PlasmaC to QtPlasmac and noticed that only the backplot for the current cut is displayed and this is erased when the X and Y are touched off again.  In PlasmaC it would remain on the screen until cleared or at least for a certain length.

I tend to cut small files and use the backplot to manually "nest" my next cut - is there a way of altering the length of backplot that is displayed?

Many thanks

Currently the only way to do that is by touching off each axis individually using the "0" button at the right hand side of the DRO.