as far as I know that is not possible.
You'll have to restart from your fullbackup and keep it in Norecovery until you decide to use recovery.
At that time it will rollback all uncompleted transactions (based on the transaction log)
btw, you can keep your db in norecovery mode and then if you decide that you've reached a point to activate the db , you can just perform
-- I think now I'm ok with the data
restore database mydb with recovery ;
btw with sql2005 if you perform a pit-restore and it hasn't reachted the PIT, it will leave the db/filegroup in norecovery mode.
However, it will give a warning it has left the db in norecovery mode.