I know how to change the settings, but when I click "other" and go to Applications, I have to choose a certain application I want to open. How can I make it open the whole folder?
try
tell application "Finder"
set tpath to path to applications folder
open folder tpath as alias
end tell
end try
Save it as a script and then place it in /Library/Scripts. This will allow you to select it as an option in the mouse preferences and hopefully it will work. I can't test it out unfortunately.