Dimmer profile / custom path

It is my understanding that Hog3 does not have dimmer profiling and you must use paths to accomplish the same thing, but I can't figure out how to design a custom path. For example: a linear path that starts at 100% and drops to 0% when the input is full. Or for example, a light that never goes below 30%. It starts at 30% when the input is 0 and increases linearly until it is 100% when the input is 100%. I have also used an "always full" path to turn on a circuit (e.g. scroller power) whenever the board is powered on and turn off otherwise. I cannot find a way to create a custom path. I'm thinking of something like the custom dimmer profiles you can create on Express/Expression, Strand 300, or any number of other low-end boards.
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