You should probably add a null referrer line to the hotlink protection, RewriteCond %{HTTP_REFERER} !^$ to make SEs happy.
Maybe add language redirection, ie:
RewriteCond %{HTTP:Accept-Language} zh [NC]
RewriteRule ^.*$
http://www.chinese.url [R,L]
worm killer (keeps worms looking for windows servers from getting your 404s thus wasting bandwidth)
redirect /scripts
http://www.stoptheviruscold.invalid
redirect /MSADC
http://www.stoptheviruscold.invalid
redirect /c
http://www.stoptheviruscold.invalid
redirect /d
http://www.stoptheviruscold.invalid
redirect /_mem_bin
http://stoptheviruscold.invalid
redirect /msadc
http://stoptheviruscold.invalid
RedirectMatch (.*)cmd.exe$ http://stoptheviruscold.invalid$1
RedirectMatch (.*)root.exe$ http://stoptheviruscold.invalid$1
RedirectMatch (.*).dll$ http://stoptheviruscold.invalid$1