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You are correct that this is a feature request as written. I think there is also a doc bug (the docs should probably mention that changing delimiter after class creation is a no-op).
To add this feature the computation of the regex would need to be moved from the metaclass init to the object init. The question is, was doing this in a metaclass a design decision (perhaps a micro-optimization?), or a "cute trick" that turns out to cause unintuitive consequences? I think Barry was involved in adding the Template feature, so I'm adding him as nosy (I don't have a clone handy to check hg annotate).