Custom build steps?

[Xeverous]

Sorry if this is not a proper place but there is no type of contact anywhere listed on the wiki or in the README

I have a plan for static website that needs custom build steps. Statik seems good for such thing because ORM-style data and assets would make it very easy to manipulate (great design IMO, havent found any generator with similar thing). However, I don't see any way of embedding custom build steps in the process besides jinja2 tags and linked Python code that would do the work. This arises few questions for me

• Is there a way to call/reference custom build steps from Markdown (or other data) files? I would like to embed some additional data into final content (eg LaTeX, specific dynamically pre-rendered HTML content) - the best thing would be some custom tags that I can put in Markdown files that will call external tools to preprocess it. Jinja2 templates do not seem to be viable for this as I would need a separate template for each post.
• Is it possible to have advanced, multiple, independent paginations? Something like a website that contains multiple different "books" where each has own pagination and page numbers and each article/chapter in each book has a link to next/prev