haute
I'm a big fan of IDA and Garmin, so I could try to help you. But, unfortunately, I don't understand what you've written. Do you want to find all functions referencing some string?

Concerning MOVS R0,R0. It's better to use the perfectly legal NOP instruction, which is encoded as 0xe1a00000 in ARM mode, and 0x46c0 in Thumb mode. NOP doesn't affect CPSR register.