I guess you don't push web servers. They're "apps", not system software. Anybody who deploys non-trivial web-apps knows this. Per-app web servers, standing behind a proxy, with a shared session-db is the most ideal way to get things done.

At this point in the game, Apache-class servers are glorified proxies, and occasionally dole out static data when you're not using a CDN.

I have customized my web server so much, I would've had to wait for years to see the changes in Apache, nginx or lighty, if ever.