Stupid iMessage question using diff apple ID

Right now my main email for iTunes, app store etc is email1@gmail.com (obviously not exactly that but just for clarity sake). I know you can use sharing etc but my wife and I never did. She never really used apple products until recently now we have both bought stuff under email1. So we both log in using email1. This is a pain and has become a problem ONLY when using iMessage as both the sent and received messages show up on the same side of that makes sense. So I have an old apple ID that I've never used as far as I can remember. So I've set up iMessage and only iMessage to use email2@yahoo.com. Seems to work as my iMessages now function correctly and I can still update my apps using email1@gmail.com.

Will this configuration present a problem ever? My wife is using ios6 I'm using 5.01 due to being jail broken. Just wondering if this will screw up once I upgrade to 6 or something or any other problems you foresee.

Sorry if I'm confusing I'm on a flight typing this on my phone.