This sounds reasonable to me, and would fit nicely with crbug/651905 if we wanted to combine them as a single launch bug.

We do apply the owner's settings to non-signed-in sessions (like the sign-in screen) for:

* UI language (locale)
* Swapping right/left mouse button
* Enabling touchpad tap-to-click
* Time zone settings
* Virtual keyboard (maybe?)

So we could expand this to other accessibility settings.

This would be easier than trying to load per-user preferences when selecting a user pod, but it doesn't address having multiple users with different accessibility settings.

We also activate per-user-POD input method on focus.
So setting keyboard rate seems also reasonable.

I don't think that applying "Swapping right/left mouse button" or "Enabling touchpad tap-to-click", or "Time zone settings" or "Virtual keyboard" should be set per-user-POD, because mouse settings do not have visible feedback, so it might be very confusing if user activates POD with weird settings and then tries to click on status area, or whatever.

We also cannot apply locale settings per-user-POD, because changing locale is very long and resource-consuming operation.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c97cc0aacb1a2940f798715c6538b6fc43ee5243

commit c97cc0aacb1a2940f798715c6538b6fc43ee5243
Author: xdai <xdai@chromium.org>
Date: Sat Feb 18 18:10:04 2017

[Chrome OS] Expose keyboard auto repeat delay/interval to login screen.

BUG= 673901 
TEST=manually

Review-Url: https://codereview.chromium.org/2697413003
Cr-Commit-Position: refs/heads/master@{#451477}

[modify] https://crrev.com/c97cc0aacb1a2940f798715c6538b6fc43ee5243/chrome/browser/chromeos/language_preferences.cc
[modify] https://crrev.com/c97cc0aacb1a2940f798715c6538b6fc43ee5243/chrome/browser/chromeos/language_preferences.h
[modify] https://crrev.com/c97cc0aacb1a2940f798715c6538b6fc43ee5243/chrome/browser/chromeos/preferences.cc
[modify] https://crrev.com/c97cc0aacb1a2940f798715c6538b6fc43ee5243/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
[modify] https://crrev.com/c97cc0aacb1a2940f798715c6538b6fc43ee5243/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h