Tip
For greater security configure KWalletManager to use one wallet for local passwords and a separate one for network passwords and form data.
Some apps, e.g. octopi, offer multiple options for password entry, e.g. gksu besides kdesu. gksu then offers to store a password, say the root password, in the gnome-keyring to save you the bother of repeated entering of the password in short intervals of time. That gnome keyring is a "wallet" separate from the KDE-wallet. Another separate "wallet" is the file /etc/passwd for login passwords into Gnu/Linux.