Most of these are micro optimizations that matter most on a larger site. Most large site do not use Apache for static content. I agree, nginx would be a better first choice for a module.

One thing that may not be obvious about minimization is that it does not yield much size reduction when coupled with gzip. You may see 30% decrease in size with minimization on the plain file, but when you gzip both the plain and minimized you may only see a difference for a couple of hundred bytes. If you are worried about speed, you should be using gzip for static content.