I am glad to here there is some progress and I am also glad to hear you have more apps in the works. I look forward to hearing more
Let me know if you need someone to test it.
What about asking the dev of advanced camera? he is very responsive and keeps supporting the playbook by updating his app frequently.
Advanced Camera already allows for naming pics and vids by date and time taken {must be enabled in settings}. Not exactly what the OP wanted, but it does make finding pics easier.