No, there isn't a command line parameter to silently uninstall Plus!. (the reason might be because the sponsor needs you to enter a
captcha to properly uninstall)....
See also
CookieRevised's reply to Command Line Help...
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PS: there is no such thing as "
WLM Plus" or "
Windows Live Messenger Plus".
The name of the chat client is "
Windows Live Messenger" and the name of the addon made by Patchou is "
Messenger Plus!" (version 3) or "
Messenger Plus! Live" (for version 4+).
/ 
