No hunspell dictionary support is planned as the interface to spell checking in a python environment requires too much work for something better done in a real plugin.
As for numbering sections, any time you use ReplaceAll you can in fact number anything you like inside your replace function. You have access to the bookpath and the number parameters which can be used with the func data dict to keep track of numbering and which file you are working in. No additional support code is needed.
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