I use Lockinfo and BiteSMS to accomplish this. Bitesms is a must have because of all the features it has but mainly because of the quick compose and quick reply features. With lockinfo, whenever I have a text message in the notification center, I can just tap on it and it automatically loads the bitesms quick reply window. I would jailbreak for these two apps alone! Plus the developer of lockinfo just released a teaser video of his upcoming major upgrade to Lockinfo 5 and it looks sick!
Sorry for the rant haha. But yea what you want is definitely possible.