Implementing an imageboard

I'm close to finishing my imageboard implementation. It has all the features of 4chan except for /f/ and /rs/ and so I have a few questions:

1. How is /rs/ implemented? Does the site scan the links posted in each board? Unlike /f/, /rs/ doesn't have an upload form.
2. How do the implement capcodes (what is their input syntax) and how are site moderation and administration performed? Where do they login? Do they have username and passwords? What's the admin/mod panels look like? Can moderations be done in-site and not only through a dedicated admin panel?

The board has everything except images stored in memory so it should be fast. If there's enough interest I might be able to open source it once it's done.

inb4 back to Le ima/g/eboards.

Ideal imageboard
- completely written in C with FastCGI
- under 1 MB
- full BBCode support
- ability to upload any file ``type''
- totally Javascript-free
- no ``HTML5'', Flash®, Silverlight®, Java Applet ``Beans''®, Ajax, etc.
- encryption by default
- zero CSS-styling (let the users set their own)
- UTF-8
- licensed under the Affero GPL
- no non-free dependencies
- administered with flat config files; a gooey may be written with FIOC
- no databases; just directly modify the HTML files
- no ability to ban users (moderation ∝ spam⁻¹∙freedom of speech)
- non-Google free (as in freedom) captcha enabled by default
- permanent archival of text; use something like Sphinx for indexing
- absolutely no IP logs can be kept, not even an option
- fast-loading \{Latex} support by server-side conversion to svg; then <embed> the svg cleanly