Just an idea, I have little script to generate masks for certain size vias so that they get tinned. The problem is when the layout changes I have to change all these mask shapes, either manually or find them by some common feature like a diameter, delete them and generate once more from new layout, what would really help, and probably be useful in other scripting scenarios, is that one could add a tag or a label to these shapes that they were generated then filter them by this tag.
Also if this tag would be user editable in pcbnew, one could one could select the just subset of the vias for tinning.