Basically, you have keymaps and repeater options.

If a keymap uses a key, even with repeater on, you get the keymap action.
So for passwords, you want to disable keymaps and enable repeater.

For log in, I basically enable then disable keymaps, to be sure it is off.
(I use a light key on the G15, and its sometimes off, with keymaps on, at least on initial start up of IS).
Then I enable repeater (broke mine into keyboard repeater and mouse repeater).
Enter passwords.
Turn off Repeater.
Turn on Keymaps.
Win.