Seems a recent update fixed this already, therefore closing this as Fix
Released, some other change seems to have fixed this as well.
** Changed in: network-manager (Ubuntu)
Sourcepackagename: None => network-manager
Status: New => Fix Released
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manual setup don't work in knetworkmanage
Just wanted to add that, with today apt-get update/upgrade,
networkmanager and knetworkmanager seem to have a much better behaviour.
They seem to have understood what I was trying to do and now it marked
my eth0 as "Unmanaged" with a "Manual IP address".
I'm a happy man!
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manual setup don't wo