In many cases when designing a PCB it's desirable to adjust the thermal relief/ spokes, to make soldering easier by reducing the heat that is transferred into the copper fill. The features that would be most useful is: -Adjustable spoke length -Adjustable spoke width as a percentage of the size of the pad I see two main alternatives. The first one is having this as a setting to the copper fill. Which means it would happen to all the pads on the same net as the copper fill. The second one, which is preferable is to have it as a part of the settings for the pad.