It turns out it's also rather easy to get the kobo wifi to offer a telnet and ftp service, so you can log into it and explore it easily. Unlike the boot splash screen change it's a pretty safe modification to the device.
http://soapyfrogs.blogspot.com/2011/...s-to-kobo.html
This should make it easier to disk-image your Kobo, making further fiddling a safer and easier affair. Instructions to come on that.