I have a sneaky feeling that Telus and Bell will lock down the GPS for use with a subscribed nav feature - blackberries for example. I'm probably wrong though...
If you interested in flashing a kitchen - I found this link to be all I needed:
http://wiki.xda-developers.com/index...itanRecentHome
It was really easy and you can always go back to an upgraded stock ROM if its released in the future.