On the KT, you could simply remove or rename /opt/amazon/acw/endactions.acx . That will give you an error message instead. I guess there are more elegant solutions, but I didn't dig any deeper. (a bit of background info
, slightly different context though)
On the K4 (NT), it's probably different, because the software is totally different. I don't have such a device though, so I'm unable to provide any further information.
PS: This also doesn't appear on unregistered Kindles, but I guess unregistering it only to avoid that page is not a viable option either
: Here's how to permanently disable that "feature" on the Kindle Touch (without any error messages or anything):
/usr/bin/sqlite3 /var/local/appreg.db "update properties set value='hidden' where handlerid='com.lab126.EndActions' and name='viewModes'"
To restore the original behavior:
/usr/bin/sqlite3 /var/local/appreg.db "update properties set value='windowed hidden' where handlerid='com.lab126.EndActions' and name='viewModes'"
This must be entered on the command-line of the device itself (e.g. via SSH, by using the jailbreak and usbnetwork hack).