I guess its possible to copy the custom dictionary from one blackberry to another by using desktop manager advanced restore (only restore the custom dictionary from the other blackberry's backup) but it would replace the custom dictionary not merge both into one.
Posted from my CrackBerry at wapforums.crackberry.com
ah yeah i figured you couldnt copy the word list into each other but hadda ask lol buddy of mine is constantly calling me a mother ducker and wants to play box 360 lol and my dictionary is loaded with words lol