Is it possible to write SMS on an iPhone 3GS via a Mac computer's keyboard?

Hello everyone.

I just bought an iPhone 3GS and was used to writing all my SMS’ from my Mac Pro’s keyboard by connecting my old Sony Ericsson phone to it via BluePhone Elite software (bluetooth).

Is this at all possible with the iPhone? BluePhone elite does not support this feature at all, but maybe there are 3rd party tools that I don’t know about that can enable this?

FYI: My iPhone is the 3GS, 32GB version and is jailbroken via the redsn0w 0.8 software. Cydia is installed and working well.

Thanks for reading, would love to hear your feedback on this.

M.