Ah, I understand now. Still, nodes could be easier and way faster solution (than Xpresso or Python) for what you need. Can you, just for sake providing insight into your work, and I am pretty sure there are quite a few people interested in particular work you do, provide some requirements? Even generic ones would work. Nodes can really provide you with fully parametric, customizable, user oriented rigs. If anything, we can identify weak points for particular task and improve the nodes themselves π