Why does mod_lua's web site use PHP?

Because we must start the project from a point. The lua version is coming soon.

Why doesn't mod_lua's directives can be used into .htaccess, mod_perl like?

Because mod_lua's philosophy is "the handlers are dangerous". On an ISP, this would be used to attack the server. The webmaster's Lua scripts should be executed by a Lua handler as run. The run.handler execute Lua scripts into a sandbox!

Why do you write in such a bad English?

Sorry, I don't know how to write in English.