Using pins D9 & D10 on the MDBT42Q

I'm using a pre-baked module from the Espruino store, can I flash a cutting edge build onto it with the ide similar to how I'd update the firmware normally

With the ones sold on the store you're sorted - you just need to connect D0(usually BTN1) to VCC when powering the module on - it'll then appear as DfuTarg and you can update it just like you would with other Espruinos :) http://www.espruino.com/MDBT42Q#firmware-updates