Update: I was able to package this script into an IPK which is in post #152. This makes installation a bit simpler.
On 1.4.5, it is best to install via WOSQI, as it will pop up a big message box with the script output in it, indicating you can proceed with installing the new certificates via the Certificate Manager. One of the last lines says 'This is not an error if you are on a webOS 1.x device.', so don't panic.
Install package is located here:
http://www.fordmaverick.com/GrabberS..._1.0.2_all.ipk
If you wan to read the full post, here is a link to post #152:
http://forums.webosnation.com/webos-...ml#post3415382
Original content starts here:
Ok that's what I did. I guess anything more and you're still just taking my word for it that they're right anyway.

I will upload that version to my website. Updated link:
http://www.fordmaverick.com/GrabberS...cecerts.sh.txt
After downloading, remove the .txt extention and copy to your device's usb drive, and run from a terminal window. Note: if you want to do this using wterm on-device, you must have the root access configured, or you won't have permission to copy the certs and will have to copy them using Internalz.
Also, if you use this method on a 1.x device, you will have to use the Certificate Manager in the Device Info app to accept the downloaded .crt files, as the certificate store is different.