You should post this in the appropriate PCB community, PADS or Expedition, for a quicker response.
Done! Ralph told me he's a PADS customer, so I've moved his question here.
Folks, let's show Ralph how well the community works! Who is going to be the first to help him out?
Ralph, I don' t believe you can; thermals are only defined for square, rectangular, round, and oval pads <Tools><Options>(thermal tab). When you go through the effort to define associated copper, I believe you'll need to define the thermal connection at the same time with the copper pour shape and possibly copper keepouts.
Yes you can, for any pin whether it is plane or copper pour.
Tools>Options>thermals. This gives an overall control of drilled and SMT thermals. For example click on the SMT thermals and square pad box and it will give you a drop down box to choose how to attach to the copper or plane. Choose the spoke width and minimum spokes. When you do a pour next time, it will generate the thermal with these settings.
I used this for a board with stiching vias and SMT components. I flood over the vias, but put a 0.1mm spoke width on the SMT pads.
Theoretically, you can do this on an individual component, select the pad properties>pad stacks select the pads you want to change on the layer you want to change and change the pad style from pad to thermal. However, I can't get it to work for some reason. Maybe the step above overrides the component?
This is probably best done when you create the decal in the library.
I think this is what you were wanting?