Shortcut for YM

Ctrl + G = buzz (pm in the windows )
Ctrl + H = Toggle between online and offline friends in your list mesenger
Ctrl + D = sign out from yahoo
Ctrl + Q = close yahoo mesenger
Ctrl + M = send PM
Ctrl + L = call the computer
Ctrl + K = call the phone number
Ctrl + T = send SMS
Ctrl + Y = send Email
Ctrl + Shift + F8 = show your picture
Ctrl + Shift + P = open preferences
Ctrl + Shift + D = sign with your mobile (HP)
Ctrl + Shift + A = add new contact (new friend)
Esc = close PM or room


And if you want to change your Chat Room more easily and quickly using a command script, use this:
/join room that u want to

Example :

/join jakarta global Chat:1