When i was searching internal memory solutions, i found an application called APPS2ROM
You can move applications to ROM Memory with this app in your rooted device. It means extra ~100MB.
But i have no idea about maybe it'll be harmful for you device stability.
Need to try
I'm trying it and waiting your feedbacks.
PS: Not moving apps that moved to SD via APP2SD. Only working on installed in internal memory.
I could not give url, but you can find it in Google Play.