Is there a way to omit script editor actions from the undo queue?

I feel your pain, howerver in my experience with open source and, typically non-profit, projects, a bit of patience and alot of persistence generally results in a better outcome.
From a quick search it appears that autocomplete with VS Code for blender’s python api isn’t available yet. Perhaps you’ll be the individual motivated enough to make it happen.

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You can pretty much live-edit your scripts (and add-ons) with it, in the Blender VS Code plugin by Jacques Lucke you can set it up so the add-on automatically updates itselfs every time you save the file you’re working on.

You start blender directly from VS code and blender’s console is substituted by the VS code terminal.

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