>>542
/usr/local/share/zsh/4.3.2/functions/Completion/X/_mplayer

- "*.(#i)(avi|mp3|mpg|mpe|mpeg|m1v|m2p|m2v|mov|asf|vob|mjpg|wma|wmv|asx|qt|rm|mkv|mka|ogm|ogg|wav)(-.)" && ret=0
+ "*.(#i)(avi|mp3|mpg|mpe|mpeg|m1v|m2p|m2v|mov|asf|vob|mjpg|wma|wmv|asx|qt|rm|mkv|mka|ogm|ogg|wav|flv)(-.)" && ret=0
試してないけどこんな感じ？

/usr/local/share/zsh/4.3.2/functions/Completion/Unix/_tex
に
#compdef tex latex slitex pdflatex jadetex pdfjadetex platex
とか書いてない?