Unity Extensible DFBs

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Hey guys, I have browsed this site a lot for answers but never had to post before. I know I'm posting Unity in the Modicon, but I figure many of you may also know Unity as well. I work in a lot of automation programming and perfect the Derived Function Blocks we use for a multitude of systems. For many different tasks we end up creating a block for a 3 pump system, then another for 5 pumps, and another for 7 pumps so that we don't waste too much memory. Is there a way to create a DFB that allows for extensible inputs? It would be great to just have one block that can be used for a variety of different sizes like the built-in ADD/MUL/OR/AND blocks already do. Does anyone know of any options to make blocks more scalable? Thanks!