(Gatekeeper) Unquarantine files. http://www.sethwillits.com/temp/Unquarantine.workflow.zip Automator service. Stick in ~/Library/Services. Right-click file(s) in Finder, Services -> Unquarantine. Bingo!

Unquarantine.sh

function unquarantine()
{
    for file in $@
    do
        xattr -d com.apple.quarantine $file
        
        if [ -d "${file}" ] ; then
            while IFS= read -r -d '' subfile; do
                if [ "$file" != "$subfile" ]; then
                    unquarantine $subfile;
                fi
            done < <(find $file \! -name ".*" -print0)
        fi
    done
}


unquarantine $@