OS X's hidden preferences disappeared after Mavericks upgrade?
Both of those still work for me, but you do sometimes need to run defaults commands again after upgrading OS X. If you run the commands again, quit and reopen applications to apply the changes:

killall Dock Finder


(If you also want to enable selecting text in Quick Look windows shown from other applications than Finder, you can use defaults write -g QLEnableTextSelection -bool true instead of defaults write com.apple.finder QLEnableTextSelection -bool true.)