No, no. If they kissed, it'd make the pairing canon, which would make things less open.
Nomura LIKES leaving things open, so they should stay as is.
As for Kairi/Zex, not in canon, but I read two lovely fics on it. Besides, I ship KH pairings in fanfiction only because I don't believe they should happen in-game...
...Cept Repliku/Nam, but that's impossible now. T___T
~Mega