In this instance your pedal is sending midi cc messages, correct?
I haven’t exactly attempted using my midi expression pedal with the dwarf yet, but I am assuming that within the plug-in itself, you can just assign the parameter to the midi function.
Here is one of the plugins I use in everything:
I circled the icon that you want to tap in order to assign parameters.
You will get a page that looks like this (my tabs are purple because they are assigned):
In this image, I have selected a particular parameter that I want to assign. As you can see, it’s assigned to the device itself.
You can see the “assign to” text and 4 selectable tabs.
Select midi, like so:
Theoretically that should allow the dwarf to midi learn your pedal and assign whatever parameter you want to the various outputs on your midi pedal.
Hope that helps!
Also, in terms of assigning multiple parameters to a single button or knob, I cannot answer that, but I’d think not. Someone with more technical chops might be able confirm or deny that.