Here's another vote in favor of Netherworks' Spawn script (and really, all of his scripts! I have most of them and they work just fine on Poser Pro 11.3).

As for saving a "zeroed" version of a custom expression, you could do that using Netherworks' Dial Manager script, which lets you save pose files or expression files with only the items you want to be included. You can save selection sets, which would also make it easy to also save a "dialed in" version with only the same items included. That's the only way I'd use expression presets to create a Master Parameter within Poser (without using Netherworks' Spawn, which I also have) b/c of the problem Karina mentioned: when "teaching" a Master Parameter dial how to behave, any dial you adjust in the process will get recorded, so you want to be sure only to adjust the dials you need to create the expression. If you applied a standard .fc2 expression (not saved with Dial Manager), it would add every available dial on the head to your Master Parameter, not just the ones that you dialed in, and that creates a real mess!

Two more nifty things about Netherworks' Dial Manager script: it has a way of detecting which dials have changed from their initial value, which can be nifty if you want to save the values only for those dials; and it can also "resolve" ERC dials so that the pose or expression can be applied to a copy of the figure that doesn't have the ERC dial.

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TOOLS: MacBook Pro; Poser Pro 11; Cheetah3D; Photoshop CC

FIGURES: S-16 (improved V4 by Karina), M4, K4, Mavka, Toons, and Nursoda's people

GOALS: Stylized and non-photorealistic renders in various fantasy styles