I am really concerned in managing custom words, 'cause I write a lot of slangs and Swype is only 'fantastic' when all of those are added.
However, for sample, when I install a new Cyanogenmod version in my Android; all that care and concern go to waste, and dictionary gets reset!
Nowadays modern online services sync/store as most info as possible, so when you access your account from a different environment, everything is there.
Swype Connect is definitely a good step in this direction, and its experience IMHO would be complete with personal dictionary sync.
I tried using search in this forum (as this feature must be desired by tons of users, I guess) but didn't find a formal feature request post.
Sorry for bad english,