I’m uncertain if this will translate directly to your requirements, but LB has the ability to create similar settings on a per-object basis.
Select an object and click on the properties tab in the lower right corner (default layout). If it is not visible, use Window, Shape Properties to activate.
You can reduce the power applied to that object as long as your minimum power for the layer is sufficiently low. I believe, however, that it will apply the entered percentage as a portion of the max power, that is, if your layer is set to 60 percent and you set shape properties to 50 percent, you’ll get 30 percent.
It’s been so long since I’ve used RDWorks that I’m not sure if this is the answer you seek.