Extruder selection in "Object List"

Hi there,
i have multiple models aligned together and would like to select the second extruder for a couple of models. Unfortunately there is this brush beside the model and i have to select each and every one hit the paint tool and select clear to get to select the extruder.
What is going on here?
Not to forget that this list is WAY too small, and luban is just a rudimentary slicer, PLEASE make this software more advanced, bc this is just a pain in the a**!!!
BR
Gery